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Rather than lay out an entire panel, I'd suggest you consider 2 or 3 sub-panels. I've found over the years that sub-panels let me upgrade instruments and avionics easily without having to re-cut an entire panel.
I created my own AutoCad panel drawing for my 601. It shouldn't take more than 30 minutes to create the basic outline to scale.. At least that way you'll know it's right.
There's a panel designer at this web site. It's a start. HangarZulu - Aircraft Instrument Panel Designer