Hi Murray
On my Sonex a Jab 3300. I welded a simple bracket to the engine mount to support the gascolator. The drain potrudes through a hole in the cowl.
On my previous build, a Sonerai. There was a lack of space on the engine side, I mounted the gascolator to the firewall, cockpit side. Since the gascolator was mounted a couple of hundred mm above the floor. I used a tube from the bottom of the gascolator to the drain valve on the floor. It worked fine.
Steve
Sonex 892