ewan, with feathers at the current level they are, its cost alots to bo build a decent one. You need; Speedos, NiCads, Poly/Ti etc. Middlewewights can be built in a very similar way in which the heavyweights were built, old wheelchairs, relay control etc. Alot of featherweight builders are at the stage where they want to move on to something else, but cant afford a heavy. Middleweights are a good next step for them.