I talked to Dave about this a couple of years ago, he didn't want to do this as he wanted to be different from the Seven lookalikees I disagreed, so like the setup as long as it's done correctly. Not sure what frame you're actually designing, is it a Freestyle copy with a Mini engine or are you looking at other power plants as that may determine what hubs you use. Will you be able to build in some form of adjustment for camber & caster, adjustable chamber is more important, if you get the setup right, caster should be built in. You will probably have to extend the front by a few inches to accommodate the front wishbone mounting, which in itself is not a bad thing, I would leave the shocks where they are in the picture as it may give you an area in which to build a petrol tank location.
Just while we're on this subject I think you have to decide what you want to achieve, is it a direct replacement for the Freestyle, bearing in mind any that are not IVA'd before April 2010 probably never will be. This means your operation/business will only have a very short shelf life. Or are you looking to make a replacement for the Freestyle, if that is the case then I personally would start with a blank piece of paper making a list of the things that are right with the Freestyle & things that are wrong & then go about designing it's replacement.
Alan...