How far in are the wheels?

I am building a custom monocoque chassis for my Speedster, I do not want wide wheel arches as I think the original Speedster shape is fantastic. I need to make the front and rear track narrower to accomodate 17in x 7in alloy wheels.
My question is:-
How far in are the tyres from the outside of the bodywork on an original Speedster or a replica with standard steel wheels? or if anyone fitted wide wheels and they do not catch the bodywork when turning, how far in are they and what is the ground clearance of your car?

Thanks

Don't know how much this'll help, but here goes:

I've got a flared CMC, and with 6" wide rims on the front and 7" wide on the rear (all 16" diameter) I have about 1/2" clearance from the tire sidewall to the inside of the wheel well arch on the rear, and about an inch on the front.....

I would assume a classic (non-flared) style body would be about the same.

No tire clearance problems at all.

If I turn the steering wheel all the way to the lock to the right, the inside of the right tire (205 X 55 X 16) rubs the inner wheel well liner, but just a bit - no big deal. Doesn't happen on the left (could be a limit adjustment needing attention, but not worth the time to fix it.....)

Gordon

I have a non flaired body with 17 x 7 porsche rims, on a 68 chassis, swing axle, I put on the short axle housings and used spacers to push the rear wheel back out, I've got about 1/4" to the fender and 3/8" to the spring plate. with the swing axles they tuck nicely into the fender without rubbing. As for the front I have an adjustable front beam. If I lower it too much, the top of the tire will hit the fender.
Will you be using a swing or IRS? Also consider disk brakes, I think mine pushed the wheel out about a 1/2"

My chassis and suspension are custom, double A arm, pushrod operated at the front with Porsche 924 hubs and modified Porsche 924 rear trailing arm with pushrod operated coil overs, So I can make the track as wide or as narrow as I wish. I am working on having about six inches of ground clearance(lots of speed humps in the UK) and would like to put the wheels as close to the body as possible without it catching, looking at photo's of original Speedsters the wheels seem to be set in about 3 inches, this might look a little strange with alloys or it could look a touch 'hotrod' which might be good.
Thanks for the help so far.
Any more measuments would be good from anyone else.
Thanks