Joker:
Oh, the pain....
JMGT does a resin 1/35 1924 pattern with the Frazer-Nash turret.
It is *very* expensive, and not a very good kit. Nonetheless I fought my way thru it for 6 months & ended up with a pretty nice model ... (PS, I bought it at way less than it is going for now & considered it a rip-off at that time).
You can see some real & model pix in my gallery:
http://photos.kitmaker.net/showgallery.php/cat/14297If you search Armorama for Rolls Royce Armoured Car, you might come up with a couple threads where I covered building this thing ... it was 2005.
There are almost no pictures of this particular version -- most pix are of Aussie RRAC with the lobster-back turret ... Seems like you found the restorations and WW1 stuff -- they are good source for construction details to make the JMGT kit better. I even found instructions for a Pocher kit of a Silver Arrow tpo get the undercarriage details ...
Also see the Resicast site, WW1 era. They have a photo of a chassis which looks super, but doesn't seem like much progress on producing a full kit. A few of us have asked 'em to just kit the chassis !!!
I have a lot of photos gleaned from the net & elsewhere. If you get to a specific project, let me know/
John