Once again, thank you to
@hursit for this excellent reproduction. There is no need at all to modify, but I decided to have a bit of tinker and see what could be done to put them in other setup configurations seeing as the Capcom mounting plate is different to a lot of other setups.
Having measured and remeasured, I decided that an Original Taito Vewlix C 1P Panel was my best starting point, as it only required one hole to be drilled. (I used plenty of sticky tape under and around to try and minimize metal shards & slivers getting into the cogs.)
It's a little on the sketchy side as it means only one stud goes through a hole, but the other three studs are aligned in such a way that they still help secure it in place once all the other nuts are screwed in.
There's a ridge in the middle of the CP housing at the bottom, but there is still enough clearance room to fit nicely.
Next up, an alberto repro 2P panel that had standard Taito layout studs. Started on the 2P side and it fitted nicely.
Looking at the 1P side, if the main spinner switch was mounted facing left / to the outside of the cab, there is a higher ridge of structure on the lower CP housing that meant it didn't fit.
Once reversed, so that the switch faced right (see pic below) there was just enough clearance to fit nicely.
I made sure this was taken into account before proceeding with the next step.
On the 1P side there is an overlap with the CP surround. I couldn't see any way of resolving, so I had to trim a bit of the corner off.
As below, a good part of the moutning hole is still available, so it can still be attached firmly.
Next up, a Raf repro 2P panel had the JLF-P-1 patterned mounting bolts (I also have an alberto with the same studs, plus a shadaloo and one that possibly came from HKLegend).
In order for this to work, 4 x holes had to be drilled.
Note to oneself, all mounts are not the same.
Having taken lots of care measuring previously, I got sloppy.
I used a an official/standard plate, but drilled centrally into the oblong holes. All panels conform, but some studs are max width, and some are min width. That meant I had to do a bit of boring and sawing...
...looks good though, and now means I have a bit of mix 'n' match availability, which is pretty much the only thing I originally had in mind as a way of catering for a couple of different setups without having to change panels.
Update
Panel and spinners fit nicely into a Windy 1 & 2 cab
Spinners don't fit if using an original Windy panel, and it has raised mounting brackets.
Repro panels that use flush mounts do fit