As promised, a few photos of the sill stand tubes.
Due to the design of the roll cage the tubes have simply been bolted through on the inside, in order to avoid cutting and welding of the roll cage feet.
http://i285.photobucket.com/albums/l...ort/002-26.jpg
http://i285.photobucket.com/albums/l...ort/003-30.jpg
http://i285.photobucket.com/albums/l...ort/005-21.jpg
http://i285.photobucket.com/albums/l...ort/004-25.jpg
I will of course be cutting the bolts to the correct length!