I have recently discovered Otto models, and they are amazingly detailed. They specialise in models that aren't m ade by the mainstream model makers.
Since buying a Ford Sierra Cosworth model, I contacted them to enquire about an X100 Coupe model in the future.
The response from them was positive when I suggested it, but I'm sure that further enquiries will help to get it a place in their future product plan!
Take a look at their work at Ottomobile Home - Ottomobile and contact them to register interest in an XK8 / XKR Coupe model.
We can make it happen!

 

I would prefer XKR convertible

 

Maisto already make a convertible in XK8 and XKR form but for some reason theres never been an 18th scale coupe, that was my reasoning.
My car is a 2000my Sapphire Blue XKR RHD with Ivory/Oatmeal and Walnut interior with 18" Double Five wheels and 75000 miles.
Just as it left the factory 5300 or so days ago!

 

I've just been on their site and asked about it. Can't do any harm...

 

I have a Solido 1:18 2000 XKR Coupe Model in BRG. They were also made in Red and (I think) Black. Quality is only so-so.

Google Image Result for http://www.swapmeetmodels.co.uk/images/20090930104656-203342-jaguar-xkr-red.jpg

 

Ah yes, the Solido paint dip casting mark special, I had forgotten that one! Motormax made a 24th scale one but that looked bloated!
The Otto models are like shrinking the real thing right onto your shelf, fingers crossed that they get licence from JLR to do these X100 coupes and even an X300/X308 as I don't think there's an 18th scale XJ saloon available.

 

Here is a shot:

 

Yep, I've got that purple one- had it in my dorm room throughout college and on my 'car shelf' ever after. I think its presence and staring at me for so many years had a factor when I found my real one (in a much better color)!