The first thing to think of is, you really need a flat strong smooth floor.
When you jack up a car, as the car goes up, the jack rolls along the floor.
If it cant roll, the car may fall over, or off the jack and kill you.
The next point, a strong floor. My car weighs in at around a couple of tonnes.
Divide that weight onto four very small wheels on a jack, the floor takes a lot of weight on a very small area.
The next consideration is room. You need enough space on both sides of the car to open the doors wide. You need space for your legs outside the car when working under it.
Best thing, dig it all up, build up a level base with hard core, level the hard core with pea shingle, soak with water before laying concrete to avoid cracking, lay at least four inches of concrete over that, knock it down and trowel it as level and as smooth as you can. Lay a damp proof sheet, then lay another two or three inches concrete made with sharp sand, level and smooth that. When its dried off a bit, cover with sand and keep the sand damp for about ten days. Don't let the sun dry the sand.
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