When I get to specialist phase training I will focus on using my TT Bike. My thoughts are that the build phase could be done on my road bike and then take a ramp test on TT bike ahead of specialist phase.
Last season my FTP was 305 v 277 on TT bike, so a decent difference.
I am assuming that the build phase, is just that, and the type of bike and position does not matter too much.
Or am I missing something?!