Aidan, I know what you mean. How about veneered sheet for the back and bottom.. where not so visible ? Top, sides and doors (solid glued boards). The legs are actual metal reservable H shape so you can have two heights. I’ve not done any welding before so may need to either learn or find someone local to make them for me. Details.
(Low teak sideboard 165 cm - Living room storage furniture - Tikamoon)