Matt (Mister Boat Builder)
Over the four year span, I can only imagine your some times recurring trepidations regarding eventual performance of your creation. Artists who paint pictures freehand can only guess what strokes of the brush will create when combined into final outcome (I was at art show just last eve... speaking with and knowing the 91 yr. old artist very well). In this artistic creation of yours you have a bit better handle on the subject of eventual outcome... in that and although you have stretched this boat's canvas to its maximum capability I see these three items especially in your favor for successful outcome:
1. You are sharp as hell in building
2. You started with a real good, proven hull design
3. You have hundred or more semi knowledgeable to really knowledgeable boat owners/designers on TF to help you review and give guidance on sections of build as you progress
Personally... I do not worry for you regarding if your boat will float. In my mind's eye, having done some hull designing during youthful years and having worked on/seen umpteen pleasure boat hulls... it seems clear that your baby will float upright. By the word "squat" I meant somewhat low in the water during standstill due to weight.
Regarding power ratio to boat speed... that will not be known till she's underway. I would say that she will not be a speed demon. I also will say that she should have little to no problem cruising at hull speed. Most economical will probably be just below hull speed by 5 percent or so.
Keep your chin up mate. She will splash, she will float, she will cruise... and I believe... she will become one heck of a revered and well known private-build/restoration pleasure boat phenomenon!
Cheers!! Art