Yes, I intend to play all sorts og games. Maybe I will play with the position of the mousepad to make it comfy.
I would like to be able to move the seat forward so that my wife can use the wheel and pedals too, so a centered stick would mean another problem to solve :-)

I seem to recall seeing a pic of someone's pit, where they had a board with two holes in it, sized to accept 2 of the casters from the typical 5 caster office chair base. They just rolled their chair over and dropped the front two casters into those holes. The board was attched to the rest of their "pit" frame somehow. Use a thick enough board, and even enthusiastic operation of the pedals shouldn't lift you out of the holes.

That is going to depend on:

What schedule (thickness) of pipe is used. (Higher schedule numbers are thicker, and therefor stiffer)
The number and placement of frame connection points, etc.

Keep in mind that triangles are structurally stronger than rectangles.

Thanks you all :-)

Regarding the idea with a board with holes in it for the 2 front wheels, it might be a problem, if the solution doesn't prevent the office chair from swivelling.

I'm planning to use 50mm pipe, (2"). I don't know how thick they are yet, but I've sent an email request to the shop that sell them.

About the structural strength of triangles, thanks for that. I will see what they've got of fittings and bends, and see if I can include as many triangles as possible in the frame :-)

I think that when I'm done drawing the 3d plan, I'll post it here, and maybe alter it afterwards if I (we) find any problems with it, before I order materials and start the build.

Regarding the center mounted stick, I think that I've found another issue.
In my plan, the keyboard slides out from underneath the steering wheel.

I'm not sure, that there's room for the wheel, keyboard and the stick above my lap.

Here, I've added a 15 cm block underneath the mousepad. Not sure if it will interfere with the handling of the joystick. I guess i could smooth the edge near the joystick a bit. Or maybe it would be even better, if I turned the block 45' out. But that would make it take more space.. decisions decisions.....

Also, I've added the keyboard, so that you can see what I mean with the drawer like pull-out.

I added where the screen approx should be.

This pit reminds me of something I had planned for a replacement desk/simpit, specifically those two types of pedals on a sliding platform to easily convert to whichever set is more suitable.

In fact, the only big difference I can think of is that your wheel is on a fixed mount and not a swing-down arm, while in my design, the keyboard is on a fixed mount and the wheel is mounted to some swing arms that hold the wheel above the monitor when not in use.

I'd certainly like to see the finished product in action. (That mouse placement does have me concerned, though...)

I agree about the mouse placement.

Im trying to figure out what to do with it....

I think I might have figured out how to place the mouse.

Heres yet another couple of pics... :-/ please let me know if I post too much, or post too many pictures here.

Notice that the mouse is higher now that originally, and the mouse / stick slides forward 25cm / 10".

Got a bit further with the drawing.



Here you can see an overview.



Throttle, with dudleys idea for a lock. :-) Keyboard on drawer-thingies.



Throttles, now angled, on rails.



Dudleys locking mechanism again :-) A wire going to a handle near the seat will be appropriate (dudleys idea again)



..At last, getting it all sorted out. Now i just need to set it up temporarily on chairs etc, to see if all the distances and heights are okay. (and figure out what to do with the chair-lock)