Love your ideas and enthusiasm and best of luck with the project.
My only request is you put measurements in metric....lets get the yanks moving with the times!
cheers Rob
measurements will be a combination:
cabinet - imperial as is based on a 90's Bally / WMS
playfield outer shape - imperial to suit cabinet
flipper spacing - imperial to keep with well known flipper spacing
components (inserts / posts / off the shelf mechs) - imperial to suit what is available at hand
design layout, toys, ramps - metric as it is much easier to work with.