: what is the best mix, for bonding the hatch channels to the deck, vaclav uses
: the term buttered, what is buttered. also any simple ideas for foot
: braces?

Use thickened epoxy for bonding the channels - make sure both sides of the joint were sanded first. I used fumed silica to thicken my epoxy, but you could use wood flour (or most anything else that's handy!)

I got some small studs designed to be epoxied to a composite surface (from Aircraft Spruce & Specialty) that I used for mounting my footbraces. Worked very nicely - kept the tracks close to the hull.