Hi Dequincy -- your project looks great. I found a 2 1/8" drill for the gauges, which works out to just under 54mm. I believe I can make this work with the 52mm gauges and the leather. (I have already stolen my design from the dimensional drawing picture you posted earlier, thank you very much).
One thought on your side consoles. If you look at the top of your consoles there is a small gap between the top of the side panels and the lower part of the dash. On my car, there is a metal bar across the bottom of these two panels that is bolted to the chassis that connects and braces the side panels. The panels are screwed into the bar. I was able to diminish the side panel gap at the top by using a couple of small washers underneath the cross bar where it screws into the chassis. This raises the cross bar and both side panels at the same time. I think a smaller gap looks better.
thank you for your comments: let me explain myself a bit
you are welcome to steal my drawings, if you stop there your thefts i am still safe ;-)
as to the drill, i am using a drill saw that makes 50 to 51,5mm, not homogeneus, then i complete the work precisely using a sand paper up to 52,5mm, the hole must be slightly bigger than 52mm
the question is that being a soft Wood the center drill bit can easily move causing not a precission cut, so i ended it with the sand paper to get an exact circumference
i have not shown the process of this cuts, but it is quite elaborate, i used a thick Wood below the plywood and firmly attache the plywood to the thick one, this way the centering drill stays firmly centered
as to the leather i cut it afterwards using a blade, i do not think it would be a good idea to use the drill over an upholstered Wood panel, leather is not homogeneus neither isotropic so you might find the drill being suddenly blocked and tearing the leather, subsequently runining your work
gap on top of the consoles, is due to internal interference with the evaporator of the AC.
I will have to fix it as it looks really not top class, but it is a longer shot as i will have to disassemble it and improve the overall aspect of that área
thanks for all your advices,...