That is coming along very nicely matey! can't wait to see the moon-buggy stage as that is always a huge milestone
In case it's of any help as far as frame strengthening is concerned, i added a reinforced the central tunnel area on my frame made from steel box as i'd originally had flex from my handbrake area on the Sammio until i re-enforced it, so i thought I'd address that straight out of the blocks this tine.
Then rather than adding to the side frames with triangulated steel (as i wanted working doors as well!) i decided to do the rest of the strengthening with the alloy panelling and it's supporting alloy framework.
With my old v.hard front suspension i've very little body flex or creaking so far, so i'm happy with how it turned out.