Which chassis?

[Locky]

I am looking to use an omega as a donor car which is wider than a sierra as used by Chris Gibbs. But the chassis built by Ron Champion is wider, so am i better off going for the wider chassis or the narrower chassis?
will it look odd? also im pretty certain there would be less strain on the wishbones if they are on the wider chassis as they would be shorter.
Thanks for any info.