Layup depends on what resin you are using; Epoxy, VE , or Poly. Unless you are using poly you probably don't need mat which wastes resin in most cases. The easiest/lightest thing is to make forms out of 2x4 or 2x6s, trim em to fit the hull, wrap in polyethylene to keep glass from sticking and glass a 2 ply layup shell (out of the hull), pull the wood and glass the shell into the hull with some limber holes/drains. Cover the whole stringer with 3" overlap into hull; a total layup of .15-.20" is probably fine. Backfill with foam. Thats pretty much what Potter did for years.
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