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Idaho said

Did my own with some machined aluminum bushings and pipe.
I used torch heat and force from my front end loader to straighten it. (Oh the horror!)
I kept the bushing tolerances tight and at the end the pipe spun with no resistance.
Now tell me that it is not straight. :)

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This is how I do it also. Infact this is also how a heap of shops do it as well. But I will say I don't use the front end loader :)
NOTHING is going to be more accurate than a straight bar or pipe though the carrier, when it comes to setting the axle bearing ends. When you relase a housing from a jig that is under stress it can still move. Most shops will only use a jig when it comes to setting multiple linkages or spring mounts on the tubes. Not necessary with leaf spring mounts.
People like to throw the word " Jig" about with diffs so they can sound like a pro, but fact is that the real "pro's" know to build them with a simple bar, bushings and some talent.