thats pretty good but constituent particles are in fact experienced any time you experience a fire hydrant. likewise constituent movements of mind are experienced when you experience an ordinary emotion etc. they are both experienced in the sense that they appear to consciousness (though they are not ascertained as being 'this' and 'not that')
The constituent particles are experienced? So prior to the day you went to school and/or read a book which informed you of particles and atoms and what-have-you, you knew 'things' were constructed of particles? My 3 year old certainly doesn't know of particles, if I asked him what a table was made out of he'd say "I dunno"... maybe once he goes to kindergarten he'll reply with "it's made of wood"... and someday down the line he'll say "it's made of particles". These are learned ideas, they are not inherent in experience. You presently do not see particles, you only know they are present at a subatomic level and therefore that knowledge governs your perception. Presently all 'you see' is shades of color and shapes (which bordering colors imply), that is all vision consists of. Kinesthetically you feel sensation attributed to muscle contractions, you feel tactile sensations when you touch things... soft... hard.. rough... smooth.. hot.. cold. Do the colors, shapes, kinesthetic feelings and tactile sensations communicate that particles are present? No. Your present experience consists ONLY of colors, shapes, feeling, auditory noise etc.. Now this is the kicker; there are not 2 separate parts to vision (1. the act of seeing and 2. objects seen), visual objects ARE the colors and shapes.... and colors and shapes ARE vision. There isn't "seeing" and "objects which are seen", the objects are the seeing. Colors and shape implies seeing, you never, ever, ever at any time experience unseen colors or shapes... they are one process... one appearance. The 'external' field of objects IS vision and is therefore your own display. You are looking at your own state. Awareness reflecting itself to itself in it's totality... timelessly. It is an ocean of being. Tactile sensations are the same way... not 2 processes, the touching of the object IS the object, the singular kinesthetic sensation of the objects weight IS the objects weight, and there is no object apart from these sensual appearances... again it is your own display. And we already discovered that there is no "you" for the display to belong to... so it is timeless awareness or consciousness... wisdom... whatever you want to name it.. in-and-of-itself. Same goes for hearing, same goes for taste, every single aspect of experience without fail is your own display... know this thoroughly, know it innately... divorced from intellect, be it, and be free.
There are no constituent movements of mind. The 'mind' is ONLY the apparent movement. There is no mind apart from thought, and thought itself conceptualizes a compartment or container called 'the mind' to belong to. Likewise there is no thought apart from awareness/consciousness... thought IS awareness, thought IS consciousness. Nothing appears to consciousness, consciousness IS these appearances... and there are no appearances, only consciousness. Consciousness alone IS. Lucid and clear, unobstructed and pure timeless nondual perfection.
Don't believe any of what I'm saying just look at your present experience, investigate empirically... it is self-evident and undeniable.
so, therein lies much of the problem
there does seem, from the very beginning, to be a marker or identifier on the side of the object regardless of the fact that your following proofs are correct asunthatneversets. however, since they did not address the problem of physical and mental ultimates from the beginning it is of no surprise to learn that sautrantika who do not accept emptiness nevertheless have no problem asserting and accepting your reasonings (ie. there is only fresh moments of time a chain is only a mental synthesis, subject/object conceptual division, "Externality" vs "internality").
There are no physical and mental ultimates. There never was a beginning in the ultimate sense. Physical, mental, beginning and notion of eventual end, were seemingly born with the first imputation of selfhood. These notions have merely become so subconsciously engrained into you through incessant reification of duality that to conceive experience to be any other way seems absurd and counterintuitive. The marker and identifier is your own intimate state, the compelling notion that there is a marker or identifier on the side of the object is your own radiance, you are it. Your being is the unparalleled birthless and deathless principle which saturates what-is.
besides the imputations and your sense impressions, what can you know about this allegedly external object?
without external form (or nonexternal form if you are mindonly) a consciousness/sensation would be utterly impossible. so too with conceptual categories such as cheap or expensive, heavy or light. after all, heavy and light as conceptualizations and heavy and light as actual things are very different things
It seems utterly impossible, but disavow the reigning paradigm you champion and it's there to see, you just have to know how to look. There is no external or internal, these notions are based on identification with 'the body' as it is, the bordering line between "internal" and "external" is imputed as the surface of the skin. You are not the body or in the body, the body is in you, as you, and "you" is a concept, which is a thought, which is a sound, which is awareness, which is self-liberated the very moment it appears to itself in this primordial non-arising.