Wonder if it would work if you went the direction of a kit car? Your way could develop a problem if you got pulled over. The officer is going to know your not driving a Focus and he is going to question you or possibly impound the vehicle. If it was proven, you could be in deep [censored].
Granted, a Mondeo it is different, but unless you went for the flagship Mondeo, I do not see the point. Sure it would be cool to have something that nobody else has, but after awhile I think the coolness would wear off and you would find that all that is parked in the garage is a typical family car. Just run of the mill Ford quality/power/technology. After having some of the toys that you have/had, I believe a disappointment would follow.