To find out what makes this nearly $600,000 restomod by Theon Design tick, we took it for a spin. Do you want to know what sets Theon Design’s restomod Porsche 911s apart from the rest? A/C frunk door open. I know, the trunk is an odd place to begin when talking about a £500,000 (roughly $600,000) Porsche whose unusual supercharged flat-six is the most obvious talking point. If you want to know how much work goes into making one of these radically re-made 964-generation 911s, all you have to do…