Is your front hub width established? The fronts are harder to calculate because you have to take not only tire to fender clearance on the outside into concideration but also lock-to-lock clearance to the frame and suspension components on the inside. I would suggest mocking up a cardboard tube tire/wheel combo and then making a wheel mounting face you can slide them in and out on to work out the clearances.
The rear is easier. I like to set the offset to something more to the negative. Your rim is 11" so set the offset at 6 or 6.5 to minimize loading on the axle bearings. Now this is for a 1:1 car so you can do whatever you think looks good for your model. The only change is housing width and that will need to be built to the offset you decide on.
Mark
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"Bad Ast" Astro Van Pro-Touring Project.... Heat, beat, file to fit, paint to match...
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