I and others have already done that in the past, 1/4 it all youneed! Its perfect stuff for the job!
All the red dots are Starboard.
Dash 1/4 I got from the scrap pile at local mariner for $10
Front bulk heads 3/4 and Floor covers 3/4 I bought a full sheet
Gas tank covers 3/8 that I bought full sheet and then the coustom tackle box made all out of 3/8 except door 3/4