Colin you're a natural candidate for owning a square Land Rover; they are a huge Meccano kit and spares are readily available new and second-hand so you can go on repairing them and rebuilding them ad infinitum. We used to own a 1986 ex-MOD 90 and we got a friend in the RAF to pull the service record, which revealed an astonishing number of rebuilds and refurbs over ten years; so much so that I think only the chassis, bulkhead and engine were the originals. I upgraded it to Defender spec by adding all kinds of bits off scrap Defenders; power steering, assisted clutch, wash/wipe and intermittent wipers, "quiet" spec transfer box, plus a whole lot of other smaller bits and pieces.
On punctures, I have no faith in the sticky neoprene patches except as a get-you-home fix for when you've used your spare tube and punctured again. I buy Tip Top glue and patches in bulk and will repair a tube three or four times before throwing it away; the brown layer on a Tip Top patch actually melts and vulcanises itself to the tube so, done correctly, they are permanent.