I kinda agree with superdave about cutting apart a classic to do an openbow. Saw a guy do it to a wood deck Campbell cruiser once. Almost made me cry.
On the other hand it's not as hard as ridered was told. I think he was gettin' smoke blown up his hole. You have to put in 2 bulk heads on each side (3 if you want to make the space in the walk through useable for storage) or the deck will sway back and forth. If you have an old open bow Bahner, you know what I mean.
Some bracing under the forward part of what's left of the deck, a little reworking of the floor and you're home free.