Cross puzzle - business card format

This is a tricky geometry puzzle wrapped up in business card format. I designed this as something to leave in geocaches. It has all the pieces and instructions in one handy package, straight off the printer.

The pieces can be assembled into a cross. If you can't work out how to do it, the solution is in the code :-)

21/3/15
Fixed the customizer script so that text now generates

8/4/15
Added a few features to the customizer script. including solution and an optional long line under t