Measurements for a real scale stage? Please help!

I've been thinking for awhile now that i should make an entrance way cause the jakks ones arn't very big (well not big enough for me)and i need one so my question, Measurements?, How wide/tall should i make the base of the stage and how tall should i make the entrance structure (tron, ect.)that sits on the stage itself to be in scale to an RA figure, Cause i want it as big as it is in real life but for the RA figures, I hope the way i wrote it makes sense to everybody, thank you for reading and Karma will be given out to who gives me the measurements of course, take care