@tig said:
There's nothing that I know of that does what you want
Didier Bur has a "lines to tubes" tool [ http://sketchucation.com/forums/viewtopic.php?p=88592#p88592 ] that'll make all of the selected edges into tubes.
You can then Intersect them to make edges around their intersections... BUT the trimming of them to each other needs manual labor.
As the innards are unlikely to be seen then that might not be as issue [remember that 'Sufficient is fit.'].
Also if there are several repeated elements then these can be copied across, rather than made individually...
Thanks for that TIG, its done what i needed to do just fine. As you say the corners just need a little tweaking but nothing to serious. Again many thanks for the help, this has saved me quite a few headaches
Chris
Ps. Who do the donations go to? The writer of the plugin?