Grantmac said..
Thoughts on putting a mast track on a higher volume flat rocker wing board?
If what you're looking for is a plug and play 120+l winDfoil, you could try to find a RRD Beluga (some have a mast track) or RRD pocket rocket which was one of the first sub 2m windfoil board (still big volume). The 2m version is almost 150l.