I've been lucky enough to obtain one of his models from Amy as well. No pressure, its yours now - do what you want. Harry was always trying to help the rest of us do better.
The Hemmings article states that only one was built as a prototype and escaped the crusher. I would have loved one of these! Later models built on a Lemans chassis would have been cool as well.
I received mine yesterday from an eBay seller in GB. Took 2 weeks for shipping, $46 total. It looks like a really cool kit, the only downside is the typical Heller clear parts that will need to be carefully masked and painted.