Best order to do base coat clear coat on 2 tone

[svr]

Ok heres where im at, truck is in pieces and i am painting the parts as i go. I am useing urethane 2 part primer and 2 part urethane base and clear. Easy to figure out on the parts that will be only one color, prime, sand then base coat and clear coat within tech sheet requirement of 30 min to 24 hrs. Problem comes with how to get 2 tone lines in proper place with out haveing truck assembled.
Should i paint the complete truck the primary color with clear coat then assemble and do the second color on top of the primary color and clear coat after i mask off the lines? Or should i just do primary base coat then wait until assemled and do the second color and clear the whole thing then, would require scuffing either way it looks like to me. Trying to not pull a giant screw up in this process.
Any thoughts or suggestions would be appreciated.