Building your own kit wouldn't be too hard I don't think but that depends on what resources you have available to you. The most difficult part of manufacturing the kit I have would be the plenum spacer. But if you went without that and drilled the holes in the plenum for the cooler hoses then it would be much easier. The kit really just consists of hoses, clamps, cores and a pump. If you want to attack this yourself then I'd suggest finding a kit you can measure up to manufacture your own. Benny.