I built my own from 2x4 as its generally a rarely used item. I put it together with deck screws and disassembled when done. It was mounted on wheels so I could move around. I wanted to idle above 2Krpm for 20min to break in new cams and Rockers as recommended. I also wanted to set flow on MFI stacks before putting in 914 with difficult access and check for leaks. Worked great. Here are some pics. Getting ready to use again with latest engine build.
John