I guess the more I talk this out it makes sense to install the pistons, rings, and rods with bearings to check clearances and then go from there. Correct me if I'm wrong, please. (clear as mud....)
Sounds like you have everything ready to go in. You have answered your own question. At this point, anything more than installing the pistons with the rings on them, then checking the rod journal/cap clearance with plasti-gauge would be extra, unnecessary work.
I have put a number of different types of engines together after spending a lot of money on parts and machine shops, but still, my shorts ride high every time worrying about what I am about to screw up, so I feel your pain.
You've got this! Good luck.
