Without going into discussing the Yid-Lus and sGyu-Lus so much (unless relevant); let's discuss mainly the Ja'-Lus (the Rainbow Body), Lus rDul Phran (Atomic Body), Od-Kyi-Lus or A'od-Lus (Light Body), and Phowa-Chenpo (Great Transference Body) in possible relation to the practice of Trekchö.
It seems that the final Fruition of Anuyoga and/or Anuttaratayoga Tantra is the Ja'-Lus; the Fruition of Trekchö is the Lus rDul Phran (but not necessarily with either the Rainbow Body or the Light Body), the Fruition of Thögal or Tögyal at the time of physical death is the Od Kyi Lus or A'od-Lus, and the Fruition of Thögal before physical death is Phowa-Chenpo.
This being said, it is taught that for the Fruition of Thögal, our Nadis or rTsa must be healthy (this is implied in Heart Drops of Dharmakaya
Is this the same for the Fruition of Trekchö?
Could anyone reference some teachings that might say as to whether or not we need very healthy, or at least relatively undamaged, Nadis in order to 'achieve' the Fruition of Trekchö?
Some Dharmawheel reference threads (no time to post links
"Rainbow Body Misconception"
"Tathagatagarbha and Eternity"
"Mind, Rigpa, and Body Relation"
"Saraha, Moksaragupta and Dzogchen"
"Difference between Dzogchen and Mahamudra"