I’m going to post a link to a video by the creator that explains everything about his tools he developed. Got part way into the description of the first templated board and went, "Holy Cow! I must get these.
Need hole sizes for different size AND style bolts? you’re covered
Need the right width and depth for inserted bolts and nut heads, even countersunk ones? He made templates for those. All of the templates are a free download from his site.
There’s a couple more templates he made. Just watch the video.