You are going to need to finish the front attachment point which requires to have the tank on so it does not make sense (to me) not to do it with the tank on. While you are at it, you may want to finish the gear leg fairing (if it is a 7A) so you are done with this portion of the project.
My 2 cents only
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Phase one