My existing oven, put together using surplus building materials, electric lamps and a simple temp PID, has worked well but needs constant supervision (checking and adjusting temp ramp, soak timing etc). I am building a large garage/workshop so decided to build a better oven. To that end I would like to add a comprehensive controller. EasyComposites oven controller looks like the sort of thing I need but they don't, at present, sell it separately (their oven is way too small).

Any ideas where I can obtain a suitable controller, new or used?

Speak to eurotherm,they will have what you need

Easy Composites controller is very similar to the Omega CN7800.