I wish I could afford a huge block of balsa to hollow out!

Like Daveo said...the bulkhead/stringer construction for a turtledeck is really nice. Light too....

You can take it a step further and sheet over the stringers with 1/16 or 3/32" balsa if you like.

Research a few models that use those types of construction and just duplicate it to suit your needs.

Good Luck!

'Nite