can i stop you there and make you back track a little the most important part is your screen so you need to build the frame that holds it
only after the screen support is built do you build your steering slider
with the support frame built at the pedals area you can use one of these or use a plate to bolt too its your choice
as the stand is held onto the round upright bar and fastened with u bolts
everything below that you can build it to suit but the main part is that screen stand where yours is the steering wheel slider when it should be the lcd support
otherwise your going to on top of each other as it stands now
have a look at the gaming sim chairs on google note how close they are to the screen depending on your size of screen its better being further back it can be adjustable
steering control can be on 2 sliders instead of your single slider which is fastened to your lcd stand
these are fixed but note how far back those screens are
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I bought my lad a racing chair rig for his birthday, was £200ish iirc on sale (last one).
He uses a Logitech G920 wheel/ pedals/ shifter.
Had 5 years use out of it so far.
The Logitech needed some major work last year mind, too much plastic, a company makes a CNC aluminium gearbox housing for them so may invest in that.
Notice the new generation Logitech are Direct Drive..