The lego is a great idea but perhaps suffers from gravity...? I recently bought some 'snap & glue set squares' off EBay dead cheap. They have an inner and outer section with magnets to hold them together either side of a right angle, keeping the angle squared. Since you can position 'em halfway up a wall it's perhaps a bit easier to keep them out of the way of the glue.
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A blog by Will Vale in RMweb Blogs
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The lego is a great idea but perhaps suffers from gravity...? I recently bought some 'snap & glue set squares' off EBay dead cheap. They have an inner and outer section with magnets to hold them together either side of a right angle, keeping the angle squared. Since you can position 'em halfway up a wall it's perhaps a bit easier to keep them out of the way of the glue.