Should I install doors, add weight, adjust, then paint?

After many years I am finally ready to prime and paint my user name sake '73 barracuda which has turned into a '70 clone. On my previous and first painting project I learned the hard way by painting the parts before assembly and some panels did not match. My plan this time is to paint the inside of the shell, jams, interior of doors and trunk lid etc. Then hang the doors, try to mask off everything, then spray exterior with high build primer, block sand, etc. then do the final paint. I would like to get the doors adjusted so I do not have to go back and make any adjustments after the windows have been installed. While adjusting the doors should I add weights to the doors? If so I can find the windows and hardware which are in the attic to weigh them; however does anybody know how much weight to add?

If I understand this right, you are thinking that the added weight of the window glass and hardware will affect the door adjustment? It wont. I was wondering why you intend to paint the backsides first, then the face sides. Primer overspray can still get to the freshly painted ineer sections.
Are you painting a metallic? I ask this because you mentioned painting separate leads to an inconsistent color match. Shops paint cars when apart most of the time. The trick is to hang the panels in the manner that they are mounted on the car. Doors and fenders upright, hoods and decklids flat. Spray the paint in the same direction that you would as if the car were together. Paint all panels at approximately the same temperature and with the same batch of paint.
One other idea...Paint the backsides and let dry for a few days. Flip everything over and paint the face sides. THEN assemble the car and spray two more fogging coats . I've done it both ways. Good luck.

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If I understand this right, you are thinking that the added weight of the window glass and hardware will affect the door adjustment? It wont.

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On an E-body, it very much will affect the alignment. I learned this the hard way a long time ago. The door glass, mechanism, door latch, handle, panel, etc weigh about 38 lbs per side.
On my last project, I added weight, then aligned everything, turned out perfect!

If you are painting metallic, don't paint the panels separately. On my 70 cuda it was done as follows:

1. Prep all inner surfaces (door jambs, engine comparment, etc)
2. Install and align all panels (with rebuilt hinges, etc)
3. Block and prep outside with the panels installed, so all lines line up perfect. Get everything ready fo paint.
4. Remove panels, and paint all interior surfaces
5. Re install and final align all panels.
6. Mask all gaps and inner surfaces (it can be done, I had zero overspray, but took about 2 days to do!)
7. Paint outside
8. Touch up bolt heads using air brush. It looks 100% like it was sprayed together.
9. Blend together any visible masking lines (polish)

This was done by a local painter, and I'm extremely happy with the outcome.