Gluing the last piece of ABS

I'm plumbing the drain for a shower which consists of several short pieces of pipe and several fittings (Short pipe from the drain to a p-trap. 90 street el out of the p-trap. One foot pipe from street el to a 90 elbow. One foot pipe out of 90 elbow to a coupling. Coupling to a one foot pipe out of an existing sanitary tee.)

I cannot see any sequence of putting these pipes and fittings together that will allow me to push and then also twist the last connection. It seems to me it is even going to be difficult to get the last piece in at all, but I think my best shot would be to glue the coupling last (assuming I can get the 2 pipes being coupled far enough apart to slip it in) and then to twist the coupling.

I've also considered using a p-trap with union since the components are in an open area. Then I could connect the union last.

Any thoughts?

1) You shouldn't be putting the 1' length of pipe out of the return 90 on yer trap into a 90. Either use a long sweep 90 or fabricate a long radius 90 by gluing a 45 & service 45 together. Reason is, 90's should not be used in horizontal drainage, it restricts flow.

2) Do you have access to all this drainage pipe & fittings from under the floor ( is ceiling below open )? If so, work your way from the sanitary T back towards the trap connection. The last fitting you would glue is the return bend or U fitting. After all the piping is together and the return 90 & nipple coming off the shower drain are in place, it's easy-peazy to just glu the return bend onto the 90 & nipple. Hope this helps.

Thanks for the advice!

1) I think I have clearance for a long sweep 90.

2) It's OK to just push the U fitting onto the nipple and return 90 without a twist too?

Yea it is. Don't forget to glue it though.