Thanks for all the kind words! 
To answer the questions - the cost of doing this depends on who you get to trim them and where you get the seats from. As a ballpark number, I'd budget on about £1000 for a decent retrim - as the standard Recaros are fabric, the foam will need to be changed for the leather - if your trimmer suggests otherwise, walk away! Add the price of your seats and you have your ballpark price - I'd look for second hand Recaro SPGs if you are looking to retrim. The other expensive bits are the seat mounts - both VAC and Machtschnell have items and I can see why they are pricey - lots of precision threaded holes! The side mounts from Recaro are fairly reasonable for price as are the slider kits - again, depends on where you buy them from.
In terms of the seat belt routing, I'm with you all the way and in fact, I'm looking to route the buckle through the harness hole. Trouble is, the seats are narrow and so I'm not sure my fat backside and the buckle will fit!!
Let's see how that pans out...
The seat mat emulator supplier was very supportive with the issues I had - the unit was wired in right with the switches in the right place - there is always the chance of codes being there if you don't disconnect the battery and so on - eventually we concluded that the battery being low on charge probably caused the issue - with a full charge the code has stayed away so far. I am going to look at coding out the seat mat emulator, I just needed a quick fix to get through the MOT, so I'll keep this thread updated.
@maxman - drop me a PM and let's see if we can do a deal!
I really can't recommend these seats enough - very comfy on a run and awesome on track, you can 'feel' the car beneath you so much more - but that's me, seats like this are a personal thing!

To answer the questions - the cost of doing this depends on who you get to trim them and where you get the seats from. As a ballpark number, I'd budget on about £1000 for a decent retrim - as the standard Recaros are fabric, the foam will need to be changed for the leather - if your trimmer suggests otherwise, walk away! Add the price of your seats and you have your ballpark price - I'd look for second hand Recaro SPGs if you are looking to retrim. The other expensive bits are the seat mounts - both VAC and Machtschnell have items and I can see why they are pricey - lots of precision threaded holes! The side mounts from Recaro are fairly reasonable for price as are the slider kits - again, depends on where you buy them from.
In terms of the seat belt routing, I'm with you all the way and in fact, I'm looking to route the buckle through the harness hole. Trouble is, the seats are narrow and so I'm not sure my fat backside and the buckle will fit!!

Let's see how that pans out...

The seat mat emulator supplier was very supportive with the issues I had - the unit was wired in right with the switches in the right place - there is always the chance of codes being there if you don't disconnect the battery and so on - eventually we concluded that the battery being low on charge probably caused the issue - with a full charge the code has stayed away so far. I am going to look at coding out the seat mat emulator, I just needed a quick fix to get through the MOT, so I'll keep this thread updated.
@maxman - drop me a PM and let's see if we can do a deal!
I really can't recommend these seats enough - very comfy on a run and awesome on track, you can 'feel' the car beneath you so much more - but that's me, seats like this are a personal thing!
