My first changes after tracing out the sponson insides onto 1/16" birch was to change the bottom of the parts. Knowing the kit was designed around a Veco .19, I felt that the boat needed to be able to handle the power of a newer engine design. I picked the Nova Rossi .21 5 port to rework this kit around, requiring a wider boat that packed less air than a stock kit would. To this end, I decided to move the bottom break aft from the sponson transom to frame 6 as recommended to someone else by Grimracer if I remember right. This had the effect of changing the bottom angle forward of the break from 10 down to 5 degrees as well as moving the primary pressure point of the bottom further aft, helping take weight off the prop at speed. After drawing the new bottom profile onto the the part, I decided that to decrease the amount of air under the boat it would be advantagious to remove some depth from the sponson bottom. I decided on an arbitraty amount of 3/8" to start with and drew that onto the part. This now cut into the factory air trap, requiring a redesign there as well. Taking my cue from a Roger Newton color sheet for the 1973 Pak, I scaled down the shape and drew it onto the sponson inside, including the air trap extension back to the bottom break. After removing all the now not needed traced part outline, I started looking to the transom. Here I had to add length to accomodate the transom to keep the boat at 30". I added enough material to allow the part to extend flush to the outside face of the transom and again removed the factory lines. I now realized I needed to make one more change, the height of the sponson inside at the transom. The kit has an incorrectly arced top, not the flat top of the full sized boat. This required reshaping the top of the sponson inside so that it still had a slight curve and yet matched the height of the engine bay wall. With all the outside changes made, I cut the redesigned sponson insides from the ply and set them aside while I worked on the transom. This was an easy rework. I allowed more space for the engine and pipe using a 180 degree header, totaling 4" of width. I then decided to widen the boat further for better handling, adding to each side of the hull an additional 3/8" for a total increase of 1-1/16" up to 8-13/16". To get an idea of how the new design compared to the old, I now made a widened frame 1 and dryfit the parts of the frame. Seeing that everything was looking good, I cut lightening holes in the sponson insides and frame 1. I decided at this point to take another page from the Roger Newton play book and made some additional frames, NONE HAVING THE COWL INCLUDED. I also deleted the center part of several of the frames to clean up the inside of the engine bay. I had to change the bottom of the sponsons due to the new depth and in so doing, the left sponson retained the stock diheral while the right sponson now had no dihedral at all. After getting these parts finished, including the new bottom profile and engine bay walls, I dryfit the kit and reworked frames to get this set of pictures.