I contend that welding to your frame is not the end all to the world. Like WK said, take your time. Stitch weld it and let it cool in between. Mike, you brought up an excellent idea of bumper attachment through the plates and angles. That's the treatment mine will prob see now, thanks. Especially after the spring hangars, it's pretty much do as you want. fore and aft of the hangars, you really ought to watch it and don't weld to the frame unless you have to. For safety's sake, I'm sure Grim is right. If you aren't comfortable welding in the situation, don't do it. Also if you preheat the area with a torch as he said, it will ensure a better bead, just don't get too much heat on there. Vague enough? I've seen welds break everywhere, not just bumper to frame, but roll cages, sides of brush bodies, ect. Your weld may LOOK really pretty but if you can't get good penetration, leave stuff like this to the PROs.
That said, I've got a Warn 8000i here that's my dads and I'm trying to talk him out of. I measured that and am using its dimensions when I leave space for a winch. You might get on the manufacturer's web site or call them, to find out the exact dims for the winch you want so you can make your own plate.
Bryan
Sherman, Tx
<font color=red>THE OFF- ROAD GOES ON FOREVER AND THE PARTY NEVER ENDS!!</font color=red>