My effort:
Made from some off cuts of box section, only 4mm thick, but plenty of triangulation in places were it matters. The crossmember has been moved back by about 80 mm, to make space for the Dibnah winch, which also bolts to the crossmember. The weight of the bumper is about 15 kg, while I cut off the jacking points of the chassis completely, losing 5kgs. I als shortened the chassis rails by 40 mm in length, and redrilled and sleeved the bolt holes to suit. The angle of the bumper is exactly in line with the sumpguard, so you have the least amount of drag while pulling yourself through the mud. I also put jacking mounts to the bumper. The position of the winch and towing eyes is such that it pulls in line with the chassis rails, rather than above, a lot of winches are now mounted above the framerails which is not ideal IMO.
The dibnah winch, I found in some antique shop, it was quite heavy, I reckon 25 kg at least!
To Will Warn: Sorry will, I was having a bad day when wrote my reply.
Daan