I purchased a sheet of phenolic board locally to make some MKI boards, as I didn’t want to pay $25 postage on a $3 board from the USA (postage to Australia is often a killer). I couldn’t find a template anywhere, so I reversed one from a product image online – I did make one slight change to the online product, as I didn’t like the alignment of the resistors and capacitor on the righthand side.
I think it’s pretty close as a MKI template, even if it’s a metric approximation. I’ve built a few boards using this, and the spacing does work with 1/2 watt carbon composite resistors.
MKI TONE BENDER – PHENOLIC BOARD DIMENSIONS / TEMPLATE
safety message: wear breathing protection when cutting board, even if it’s just a medical mask.