An absolute dream Crayphile! I've visited the guys in Cali as well, been staring at Futch's Singer and couldn't stay away from the yellow Singer at Goodwood this year. They're absolute jewels, I adore them.
I'd look for either a pastel'ish color or a variation on the British Racing Green-theme, it would be extra cool that it's a British-car in that case. Inside obviously depending on outside color, but a dark-brown with orange stitching would be my preferred choice.
Mechanically, a 4.0, central fuel filler, no rear seats and body colored/naked rear 'bench' and a full cage, welded and finished in leather. I verified in case my dream would become reality, they do that if requested.
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2003 BMW M3 CSL (sold) / 2008 Porsche 911 GT3 RS / 2013 MINI John Cooper Works GP / 2014 BMW Alpina D3 biturbo Touring