Need help with modelling / geometry problem

[ReMark]

I think the OP does have some centerlines already established. I'd have to double check the drawing though to be sure.

[b16gee]

I have finally managed it.
1. Aligned UCS with end profile (circle) of CHS.
2. Using that UCS, rotated cleat using the centre line of the edge beam as a reference angle.
3. Then aligned UCS to cleat. Then used ALIGN command to align the cleat with CL of edge beam.
4. Used UNION to make rafter and cleat 1 object.
5. Cleat is now aligned on CL of edge beam and also in line with axis of rafter.

Seems to work - thank god. Big thanks for all your help!

[Dadgad]

I'm all ears JD, I'd like to know how you would do it?

[JD Mather]

I have finally managed it.

Lets see the file.