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|³|MA3K
I use a pretty crude but perfectly effective method of checking alignment when building which is to hold a broomstick (anything long and straight will work really) against the seat and headtubes such that it extends down to the rea dropouts and measure the distance to the dropout, switch to the other side and repeat.
Also can use a digital angle finder to check head and seat tubes are in alignment. There's a not very accurate one on the iphone or you can get slightly better ones from ebay for buttons.