Hello. I’m on a similar journey learning the system also. Yes it’s heartbreaking seeing how cheap and simple vehicle modifications are in the UK by comparison.
A couple of thoughts: people have successfully imported modified vans into France. They are subject to Dreal inspection and possibly have to be ripped appart to see the gas and electrics etc. But I believe that they can get registered. I’m not sure if this includes poptops. There is a Facebook group called registering vehicles in France and it would be worth joining and reading posts.
My van - a standard 2 seat van - is already on French plates as I imported it from Germany.
After speaking to Dreal I was told that I need a French company to carry out certain mods - installing 3 extra seats (I want a 5 seat van with a 3 seater bench turning into a bed) . Installing the poptop, and I’m not certain but possibly need a French company doing electrical and gas instal. Also for vasp there needs to be a sink inside the van and fixed storage unit which can be small , and as I need to go down the vasp route as I’m wanting a poptop and removing the bulkhead then I’m going to have to have a basic sink inside. I think a ventilation system is also a vasp requirement or perhaps only with gas cooker? I don’t think opening a window or door is enough - it’s painful I know.
I want extra windows too which have to conform to eu regs (bare the mark 45R) and these can be installed yourself as it’s non structural (or have them done in the uk but I probably wouldn’t say that) and think that the rest of the build can also be done yourself.
I also need to write to the manufacturer and ask permission to do the mods!!! They will take 70€ for Mercedes and say yes. Some document called the bar rouge gets updated and this is required for the dreal inspection. This might just be due to changes in structure- cutting roof, removing bulkhead and adding seats - but I’ve been advised to add everything you may do just so it’s covered and you don’t have to do all of it and it helps the vasp inspection.
It is my understanding that once the vehicle meets the requirements for vasp , it doesn’t get inspected again and the documents don’t detail the exact setup.
So you could - and I may be wrong - get the minimum work done in France and then do the rest yourself or abroad. Obviously you can’t make a hash of it or insurance won’t cover it, but it could be a way to save money.
Get a electric hook up socket and plug inside and then plug in a hob or microwave and that’s your electric and cooker ticked off. Screw in a ikea cupboard and that’s the storage ticked off. Etc.
I believe the vehicle gets weighed at the vasp inspection so if you install loads of cupboards after or in different places then you do risk being on the wrong side of the law. I’m not sure if a CT inspection weighs vehicles? But my van/camper is going to be lightweight and basic and modular so I’ll have a permanent drawer under the bench seat but when I go away I’ll clip in cupboards to the L-track I’ll install. The sink is a pain as I don’t really want one so I’ll have to check what the most basic type of sink and tap is to pass vasp inspection.
As long as the carte gris is updated then it should pass the CT . But if you’ve added cupboards and seats and it’s not listed as a camper or 5 seater then it won’t pass. My ct Center said they don’t really look at the seating other than the number of seats which must match the carte gris. It’s possibly ok to remove them and get through and be insured, it’s when you add seats then it’sa problem.
If anyone’s bothered to read this comment and can tell me otherwise I’m all ears but this is my understanding of how the system can be played a little.