The Principles of Thermal Sciences and Their Applications to Engineering Book

The Introduction, Book I, Book II, Book III, Book VI (which was compiled by Taylor drawn from Proclus' other texts but also passages from other philosophers like Julian or Iamblichus), and especially the Additional Notes, were fantastic; but Book IV and V being 1/4+ of the book were quite repetitious (notwithstanding the repetitions of the other books).

I disagree with Proclus' Neoplatonic system. The 'Intelligible Gods', 'Intellective Gods', and 'Intelligible-Intellective God's do not really make ontological sense: If the Intelligible-Intellective Gods exist what's the actual point of the divergence of the Intelligible and Intellective Gods? To me the Intelligible-Intellective Gods (or even just a singular God in three aspects, I.e Intellect) should be a sufficient explanation; yes, there is a distinction between Intellection and being Intelligible, but this is a difference of knower and known: as Plotinus revelead, and even Aristotle ubderstood, the Knower and Known are one.

I wouldn't recommend this one over any other of Proclus' works, it's meticulous to a fault.
I'd describe it as a pile of rock with every 7th-10th page being gold, these nuggets of philosophical gold might make reading it all worth it, but don't haste towards this work before another (like his Commentary on the Timaeus) when these nuggets are present in all his works.