Floor structure garage/workshop

Hi,
I am currently planning the conversion of a rather uninsulated garage into a small hobby/two-wheeler workshop...

Since I have now received three different recommendations for the floor construction from three self-proclaimed "experts," I am a bit confused. That's why I am turning to you.

Requirements for the floor:
- Insulating effect against ground cold
- approx. 170-180 mm elevation of the existing floor
- still occasionally usable as a garage (only quite rarely, 2-3 times a year, but then with a heavy vehicle (~ 2.5 tons))
- only occasional heating by wood stove
- the usual misery: "as cheap as possible"
- impact sound insulation not required/irrelevant

Current status:
- Garage in the former stable part of our house (built 1919)
- Concrete floor, cold, approx. 170mm lower than the garage exit, unevenness up to 30mm

Previous construction plan:
- edge strips at the walls
- lay PE foil
- approx. 50mm wet screed to level out unevenness
- vapor barrier foil
- 100mm (or 2x 50mm?!) Styrodur with high load-bearing capacity
- 22mm OSB boards
- PVC flooring

Can it be done like this? Is there a flaw in the reasoning?
Is something like this feasible for approx. 30€ per sqm? (funds have been saved for this so far, if it's not enough, saving will continue)

Thanks a lot in advance!

Best regards

Oh yes, completely forgot. The highest point load will probably come later from the two planned moped lifting platforms. With a moped on them, they weigh about 150 kg and stand on four small rollers.

Best regards Platti

Do you insulate the floor in a garage? If it’s below freezing outside, you’d like to keep the few degrees above freezing from the floor, right? That would make the floor structure much simpler and cheaper. I would only insulate the ceiling and sides, and preferably better there. Because of the garage doors, you don’t need to overdo it there either. Is it mainly about being able to work in winter? With a decent wood stove, such a garage warms up in 5 minutes and certainly costs less over many years.

Hello

I have concerns that the load of the vehicle can only be poorly dissipated by the OSB boards and that the small wheels might possibly damage the PVC. However, it is certainly a "warm" solution.

Olli