I read some recent threads about home alignment and though I would share me method.
Looking at some $300 smart strings, I came up with something very similar for less than $40 and a six pack worth of time making.
Here are some pics:
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Sorry about the crappy cell phone pics, but I left my camera at work. This is all I had.
Basically what I did was make sure each corner was same height off ground as center of rim. The front and rear pole are notched at same distance. I slide the front and rear pole in tube until distance from string to front hugs are the same distance, and the string to the rear hubs are same distance. This gives a pretty good parallel string set up to start from.
THen measure from string to front of rim, string to back of rim. The difference is the toe.
I made these for my 911 DE car and get repeatable results. I fitted on the 914 and it worked very well.