Mate, are you just making one or are you "DESIGNING" and then making one?
If you are designing a IOM from scratch then the best of luck. [>:]
The measurements you ask for may be supplied by contributers here and you may get an average, but that may or may not help you complete your design.
There are so many inter-related factors that will depend on your basic concept that frankly need some design experience to make work together.
Is your IOM to be a FAT one, THIN one, AVERAGE beam, Round bilge, Single hard chine, Multi chine, PLY or GLASS, what is your designs prismatic coefficient?
Do you prefer the skiff deck or the covered deck, deck or keel stepped mast.
I sound like a
KNOCKER and that is not my normal manner.
I want to encourage you and will send you some measurements when I have done them on my hull.
I would also suggest that you look for the free plans you can download for the "Triple Crown" design.
All the hard work has been done for you and you can get on with the building of a yacht that has been proven to sail well.
Once you have that operational and have some experience of sailing, you could look at doing your own design.
Best wishes.