Sig 48" floats are built the same as yours... V shape for the front and flat bottom from the step back....Your design is fine, I always recommend a V in the float bottom to aid smoother landings... With a full flat bottom, you are more likely to bounce (or porpoise) on your landings... A V is a bit more forgiving.. But flats require less power to take off...As to your floats you kinda have a little bit of both worlds, and they will work just fine...Mount them and try em....