"Everything I try is just not working"
That is a quote from you last night and a bit distressing as it is waaaay too negative a mindset for someone so talented.
I Battle with the perfectionism and negativity myself
I really like the set up you have in mind for this dio
If this is the plan for your diorama, it doesn't matter how much it costs, just get to it and get it done.
Focus on finishing what you have and not buying anything else to try to make it better or easier...that is a fool's game.
Do a sub assembly , then another and keep plugging along putting those pieces together. When one thing is drying, crack on with another. One figure at a time mate, bit by bit, little by little and it will build up itself.
A wise JohnJ on ISM gave me that tip when my mojo was sinking. He said just do a little bit every time you sit at the bench....kind of like the joke How do you eat an elephant? One bite at a time.
You have a bit of a schedule stress, but quite honestly it doesn't matter when you finish at all....just finish. You will be proud of yourself.
Give yourself some positive thoughts as you are a great modeller. Sounds corny but good vibes and thoughts really do bring good results. Negative thinking brings negative results. I have seen what you can do in other builds, you have the skills.
Focus on finishing this and not buying something else or distracting yourself into another project or purchase
I am rooting for you, bud

and watching

Best of luck