Zeus & BigMeat have been running theirs for some time now with no problems. Joe Darlington has been making them for years. Email him with your questions - his addy is earlier in this thread.
I found pix of Joe's version but I didn't download them. They look great. I couldn't see any weld lines & he even paints them to match my Proton.
There was a write up by starchild on the installation that I did grab & create a pdf. I'll try to get it to Moncha ASAP so that he can post it (along with all the other great 'how to's' that I've gotten here). If you want to find it on your own tho: planetisuzoo - hall of fame - look for thread on diff drops by starchild.
The bottom line is that I don't want to take any business from Joe ... but ... his drop is 1 1/2 inch (& look pretty). The one I'm having made is 2 inch (& don't look pretty). The choice is yours.
If you need the install pdf before I get it to Moncha - lemme know & I'll email it.
CD done - just gotta get it in the mail.