I did it with tanks on and all is well. There's probably someone that did it with tanks off and they'll tell u it came out fine too. But I'll leave that for them. Seems more intuitive to have the tanks on for the final assembly. but I don't see/know the circumstances u are dealing with.
RV 7A RV #9700
N325KS the Flying “K”
Built in SoCal KCCB, now @ KPXE
120 Hours in Year 1 & 4x cross the USA
2018 OSH - yes