I made an infill panel to tidy up where the fuel tank had previously been removed. I cut and bent some thin aluminium sheet using shears, painted the aluminium in epoxy paint and used some sticky back Velcro strips to stick the aluminium back to some 2x2 timber which I stuck to the cab wall using epoxy glue. Then I bought some automotive carpet and stuck it to the aluminium using spray glue and trimmed round the edges. I was very happy with it against my new paint job