Depending on what strength you wish yes and no.
Most boatbuilding plans call for taped seams this adds extra rigidity and strength, pretty important when you are trying to keep out the h20.
I have rebuilt quite a few truck cabs and most manufacturers don't tape the seams allowing a very little amount of flex and expansion of the wood components.
You should not need to tape the seams as you will have about 5m of edge per side between your walls and front/roof/back on a standard 8 ft x4ft build also you will get lots of strength from the cross bracing (mostly the galley).
In my own honest opinion I would only tape if I was intending on fitting a roof rack or intended to hang an awning.

whatever you decide, its right at the time.