1) No. From what I have found on this site, OEM motor mounts are 2 3/4" thick. I suggested using three 1/4" blanks and two 1" thick pucks for a total thickness of 2 3/4". 2) You need 1 1/4" to get thru the motor stand offs and use a nut and lock washer. Probably need 1" to get thru frame and washer/nut. So call it 5 1/4" or 5 1/2". 3) I only said to tack stud to center plate in a couple places, not weld it solid. Will make up a set and post some pics.