I tried asking Dan about a custom GMM2 in Tomo Tech too and it was a no-go. I like the idea of supporting RK/Hydrodynamica. RK invested a lot in Tomo.
You see! This was my thoughts too. I think I might risk it and go Stringerless. I doubt I would ride the GMM2 in anything over head unless it was a really mushy overhead type wave. Plus this is probably the perfect design to test out stringerless.
HOWEVER, the only thing holding me up on the order (besides the immediate cash) is the possibility of a keel fin V3 Nano or a keel fin V4. I have been loving my El Tomo keel so much that I dont know if i would trade a keel fin set up for a GMM2 thruster set up, in smaller mush waves.
Right now my go-to for smaller mushy surf is the El Tomo keel and it feels pretty amazing. The GMM2 would probably fall in that exact same category, so my reasoning is that i'd have to choose 1 over the other and im not sure i'd want the GMM2 over the smooth glide and easy turning ability of a keel.