Does your SA truck have the galvanized chassis? I saw one with a galvy chassis and bulkhead which apparently was factory on some of them in SA. By the way, xylene is about all that works on the carpet glue in my experience.
One of the best seat mods I have seen in a 5 door is the use of a discovery 2 rear seat. It lowers the seating position and sits a bit further back (requires notching front of rear wheel wells to sit further back)
Lower's seating position and allows adult leg room.
The worst 2nd row seats are the "high back" after market seats. Warn folks they will hate them, get told "its what I want please install" only to get "you were right, totally unusable" later.
I've also considered fabricating an 90 NAS style jump seat in my 3 door as a second row. I'm lucky that my 3 door has a station wagon footwell. No idea if it's a PO mod or if it's an South Africa CKD quirk. With the jump seat, it would be a bit of a pain to hop in, but I imagine one would sit more than 2" lower than the stock bench.
Here's a pic from when I was removing the carpet (7 hours of scrubbing off glue).