RE: Kits or scratch plans?
You may not be interested in a full body hydro or a rigger but they will do circles around the mono in your video ----- if you're looking for fast. If that's your desire, I would suggest you consider an engine that does not require specialty glow plugs. Simply because they are very expensive and probably will not provide any substantial increase in performance. That's the word on the street anyway. My Wild Thing has a MAC .21 on 60% nitro with a remote mixture control in it and has been radared at 47 mph. It runs a 3 blade X440 prop, balanced and sharpened by CMDi. The water you show in the video is ideal for that boat. Just be prepared for a lot of "tuning time". Fuel mixture (if you don't install remote mixture) every time the weather changes, pipe length, prop selection, prop balancing and sharpening, fuel, trimming the hull etc. etc.