Nevermind whether it's structurally sound or not how are you intending to cut the holes? Handwiring requires a perfect plate or the switches won't be straight, will be really obvious using wide mods as you plant to do.
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You could pretty easily get this done usingTheoretically this is correct but remember that DonnyD is aiming to a hand wired keyboard. Those large short spacebars holes would make the switches slide sideways and glueing them could change the switch feeling.Morea couple of freely available tools, on http://www.keyboard-layout-editor.com/ create a standard 60% layout then overlap your extra space position options on top of the existing spacebar like this,Code: [Select]["~\n`","!\n1","@\n2","#\n3","$\n4","%\n5","^\n6","&\n7","*\n8","(\n9",")\n0","_\n-","+\n=",{w:2},"Backspace"],
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Now take your raw data and pop it into http://builder.swillkb.com/ with options for pok3r 60% case and corners at 2 it comes out like this,Show Image(https://drive.google.com/uc?export=download&id=1SuBJ7n3EtlPrJCOtBQM3jqnUynYUSoa-)
From the builder you can order a custom plate directly from lasergist or download the files and get it cut somewhere more convenient for you. Would not try and do any cuts or modifications to a standard plate as you will probably just make a mess and end up binning it.
In that case, what key combination would be best ? As i am planning buying only XDA, DSA profile keycaps, it will help getting right keycaps more easily. Is 2.25-1.25-2.75 most popular ? I dont think 3-3.25 that common...There's a raising interest towards 3u spacebars but I know little of those keycaps profiles.