This is precisely what I have in progress now, not a difficult conversion. That roof just needs a little tweaking. The Revell '72 Hurst/Olds and Cutlass kits are EXCELLENT starting points for just such a conversion.
I have probably 6-7 in various stages of completion at any given time. If I run into an engineering problem on one, I'll put it down and work on another.
I have also had mishaps involving spilled paint, CA glue, and exacto knives. Luckily no trips to the emergency room. But some of the stuff I'm reading on this thread is making me cringe.
I sometimes purchase kits that are not to my tastes just to "spice it up" a little. And this has not gone unnoticed by my 8-year-old nephew who is my model building buddy. He is generally a car builder, but builds the occasional airplane just to mix it up a little.