I think you need to attach the armor, and put on the suit. Get a good look at yourself. After that, if you're not feeling the same zest to finish it, it might be time to move on.
You could put some money aside and have a painter take care of the lid. That way you can work on your other projects. I did that with my TK armor. I made the helmet and blaster, but once I realized I wasn't going to have the time to finish trimming and building the armor, I commissioned it out so I could focus on other things I had on my plate. I knew I couldn't stare at a box of unfinished armor. It would drive me nuts and I'd eventually just forget about it.
But, if you really lost that desire, that fun feeling of wearing the suit, by all means, time to part with it.