I would like to see what the thing weighs, I saw the build he had, it was very nicely done.
My only complaint when I see these kind of swaps going down is would you really want to put the car on the track or even drive it down the road? Doing a swap like this means cutting into the structural integrity of the car and reinforcing everything adds weight. Just like cutting the top off a car will make it weak, so manufactures build reinforcements everywhere to keep the car stable and fun, but in turn it can add a lot of weight. This is why its best to work with a car in the layout it already has.