Hi Robin
I have not got any wing jigs to give you but my advice would be to build your own as most builders circumstances are going to be different.
I used the design from Rudi Greylings website
www.rudigreyling.com it met my needs as i still needed access via my garage door.
If you need any aluminum angle i have got a boat load and the threaded bar you can get from wilko's.
Cheers
Steve