Tom,
The Duck here, unfortunately 'a few' kits went out with that template that didn't have the holes on it, sorry about that. Mr. Adamson is correct in his dimension.
As to the 'lame' foam tape - I chose that 3/16 x 1/16 grey tape to seal the lens to the skin because it will compress to the thinness of a sheet of notebook paper. So after you fit the lens, the 'seal' doesn't work against you and push the lens away from the skin.
It's not perfect, but I think it works pretty well.
BTW - in the newer instructions I recommend that you trim the corners off of the nutplate strip on the top to allow it to fit inside the curve of the lense better. This was a tip from builders who gave me that feedback, which I appretiate.
Send me an email and I'll return a pic of that.
duckworks@comcast.net
And please, feel free to contact me.
Don