300b amplifier chassis

I am interested in learning of places that might sell unfinished chassis for constructing 300b, or similar, monoblock amplifiers. I am already aware of the Hammond and Audio Consulting products; two extremes of the price spectrum. Looking for something in between. The final amplifier design will be a pair of monoblock 300b amps and a seperate valve rectified power supply in a full size chassis (necessary due to the large handmade capacitors to be utilized).