Rob,

Not sure what there is to build after you buy the compressor. After that all there are, are airlines and diffusers either the stones or membrane type and that's it.

One thing you will find with complete system packages is the prices vary a lot. It's also good to go with someone that sells the complete system as they can advise you of the size compressor, number of diffusers and airlines for you size pond etc.

I would go with an outfit called Stoney Creek in Grant Michigan if you are in the midwest. Bill Cody in Malinta, Ohio that contributes a lot on this site can set you up too.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.