Bridge Gantry Profile

[EddyCurrent]

~andy, I too explored several designs and went from one to the other then back again, this was after much deliberation regarding ease of build and mainly a good sturdy design with cost being somewhat secondary. I therefore came back to the L design and 'borrowed' a lot of the ideas from Matt's build, http://www.mycncuk.com/forums/router...ine-month.html.
One advantage I like with this design is the lack of gantry sides which you will need in your proposal, although on mine I made add some triangulation here for added strength.

If you still want to go the extrusion route these are some links I found while researching that.

http://www.extrusions-aluminium.co.u...xtrusions.html
http://aluminium-profile.co.uk/
http://www.valuframe.co.uk/
http://www.motedis.co.uk/shop/Slot-profiles:::1.html
http://www.metallin.co.uk/shop/
http://www.8020cnc.com/
http://www.boldman.co.uk/aluminium-profile-system/
http://www.damencnc.com/en/component...inium-profiles
http://www.zappautomation.co.uk/en/6...ium-extrusions