I did make some minor but annoying errors. Worst was mistaking the locations of the screw holes and putting one set of the side adjusters with one screw in the real hole and one screw.... into the wood. Ooops. Found the mistake, found the real holes, re-screwed down and all is well.

Re-installing it is yet again a pain. Some thoughts:
1) Make sure the loose line that goes on the acc side of the unit is draped over the unit as you are installing it. Otherwise it's a pain to snake in.
2) Insert the slotted support into the mostly in screw first, then do the big screw in the front down finger tight then do the rear screw. This will minimize the chance it falls on you and makes you go OW!
But it's now up and in, next step is to work on the valve to stem connections (next post)
