Make as many videos as you like! It's all of interest! Save all your dust and muck, Bob: it is useful later for - err, dust and muck! The 'field' is brilliant! On the weathering, I struggle too - I reckon 'less is more' based on the experience I have attempted. I would not scrapyard those Commers, or the Thames, though! The Transit could be the scrappy's wheels - so keep it as a mobile unit, and the caravan is the office! The Austin A35 in black is quite rare, I think: I'd hang on to that! Remember the Range Rover is aluminium, so careful with the rust effect!
I've made some real progress with it today. Had some fun with scenery and detailing cars. I agree, the Thames Airborne camper van is too nice for the diorama. Good call on the Range Rover, they do rust, but only on the tailgate and the chassis.