[mickmate]

Is that you burning fuel on the Waikato? I am using tube to original spec, 289 are 3", 427's are 4" It is a little hard to cut and hold. I just moved a Bridgeport in so that makes them alot easier to do. RHS and a chopsaw is what I'd recommend for what you're looking at. Check out the build galleries on here for design ideas.
Cheers mate.