I am building the same boat from Dumas
It was pointed out at RCGroups that Tony indeed must have copied the DUMAS model. Of course Tony used Light Plywood and Balsa and he cut wood basically his own methods but, according to Mark, the new owner it is 33.5 Inches long and about 11 inches wide so, it matches the DUMAS size scale.
Glad to learn you are doing this model.
If I can not use that motor I just ordered from that Ryobi Circular Saw tool, and if you are interested I may just let it go in case you do not have a power system yet.