Have a look on this http://letsmakerobots.com/node/16983
What i do ,is to design the bracket i want to make in this programm ,
then i print the deisgn i put it on an 1,5mm alluminium sheet and some glue ,
then i take my dremmel 300 i cut it and then i make some lines with my dremmel
in the points the bracket will fold and then i fold where i want the bracket and its ready.
If you want to cut a bracket that is rounded in some points then you can curve it with tap .
The whole process its quite tiring but you can get great result from it and save money too.