Hi Spigot, I purchased the radne raket, prop, tank, exhaust and RAD cloned frame assy of MGrant from this site. I will be manufacturing some simple comfort bars for it to spread the harness out a bit so your sup air might be what I need. I have a Gradient Comfort PG harness and Gin one G38 reserve on ebay with a few people interested so will have to give you a ring about the harness pretty soon.
Have you got any pics by any chance or any web links about it??
Cheers Tim