in terms of gettin it done using 1 days use of the booth and oven, i guess u could get away with priming elsewhere, maybe a garage or sumthin? few plastic sheets up, and apply some good quality high build primer, then let that dry and harden for a week, then flat it.

the primer coat will need to be taken down to 800grade anyways, so any shit in the primer coat will end up being removed in the flatting process, meaning u dnt necessarily need the booth to apply that, just somewhere dry and with maybe a space heater

then wen its completely prepped and flatted to 800, roll it to the booth and u can get your base and laquer coating done in a good day

other than that, no way ur gonna get a good finish doing primer, base and laquer in 1 single day