If I was building again now and considering an OSW (like I am) then I would certainly go with 8020, no doubt.
I have plans from another guy for a design he made that features an excellent keyboard tray, far better than the Obutto one as it offers a lot of adaptability and is not quite so cumbersome if close to a wall etc.
The JCL is not great value although they do look nice.

Here you go: https://www.dropbox.com/s/g04hqyvwvofbtjm/Motedis_Rig.zip?dl=0
Here is the part list in English: http://kens-corner.com/rig/Parts_list.txt
Grumpybeard, I don't think that keyboard tray is from JCL, but I'm sure they could make you something like it.

Hows the replacement seat going Barmy?
So if you know anyone looking for some Fanatec kit give me a shout.