I've just picked up a generic winch tray. It's a bit bent, but it's got the mount holes, the fair lead holes etc and it's got welded braces, it not wide enough to bolt straight into the chassis legs but it might get you started. Yours for the price of scrap+post so probably about 12 quid or something.
Dont seem to be able to sent these for some reason so Ill post them on here. The diference between a defender one and a disco one is how they fasten to the chassis. The defender bolts are vertical, disco and rangie are horizontal (I think)
Here at LandyZone we have plenty of very knowledgable members so if you have any questions about your Land Rover or just want to connect with other Landy owners, you're in the right place.