Bonanza cr400 engine plate placement

I need some help with measurements for an engine plate for an unfortunate cr400 I got! I only want to do it once and do it right! Some butcher with no common sense hacked the original one off and installed what can be best described as a piece of scrap metal in its place! Any help with specs, front to rear as well as side to side slot placement etc. would be ideal, as much info as possible to help save this poor thing would be greatly appreciated!
I am planning to carefully remove the POS that is on it and clean and prep theframe for replacement! I will be getting or fabbing a tank and will get a tecumseh to bolt on the thing! Thanks in advance!