I have only built a console so I can not speak for the full monty, but, I put the T-molding on last. I wanted all things in place so if you need to tuck something into the routed groov to tighten something up you could use the t-molding as a "tool" of sorts. I used shelf paper on the top of the console and the t-molding helped strech it out. The other feeling is that if you are going for a clean finish, to put in on last so it won't get scratched during construction. Just my thoughts. good luck.