MÜPRO Frame building

Hello Experts,

I must make a lot of frames with MÜPRO parts and am trying to make this process easier on myself. 

These frames exist of rails, which are connected with connection parts.

Right now, I must extrude every individual length of rail, and constraint them all together manually with the connection parts. 

To make this process easier I started using "Structure Systems" to make the rail parts, and then add the connection parts later. This works, but I'd love to also have the connection parts be added automatically to every intersection, without having to constraint them all manually.

The second option I tried was piping. By making the rail a "pipe", and the adding CPoints to the connection parts, the whole process can be mostly automated. 

In first this seemed to work, but I soon discovered the piping feature doesn't like when you have to connect most of "pipes" together. This gives a lot of constraint errors, and in the end I'm spending more time fixing errors then making the frame. Also, there is no "elbow" part (only rigid 90degree angles) which is a problem for this feature. 

Does anyone know a neat solution for this? Maybe a way to setup piping so there won't be any errors. Or is it possible to automatically add the corner pieces to Structural Systems. Or maybe a whole different solution.

I would love to hear your idea's.