How to build a deck on a small beachcat?

I have some old Nacra 5.2 and a Tornado hulls that I would like to build a lighweight hard deck on. 8' x 8' and 10' x 10' roughly. Any suggestions or comments

 

Easiest if you can get some old mast sections like the ones they used to support the hulls in the first place, and bolt a plywood deck on those.

 

There have been several articles on doing the same thing, either here or on Woodenboat forum.
Use the original beams and build from that.

What will you do with these? Power boat or raft or ???

Realize that you won't want to stand on the aft beam, the hulls will sink a great deal.
So it matters what you want to do.

 

TheSORis vague, I assume you will use subject craft as a boat?
I’ve seen this done over and over with no thought to how much weight the hulls can actually support.
The results are usually poor to horrifying, some become submarines.
Your hulls might see better use if utilized as amas to stabilize a center hull.