Generally you have a good shape, helmet needs major revisions, such as the visor. You need some more armour, cod, knees, shoulders; try something knew like arm plates since you are making a custom. I like those gloves though, they somewhat look like the Fett gloves.
You may want to shell out about $35 for a Dickies jumpsuit, and if you can sew, buy some material for a vest, I have the plans if you'd like them, I didn't make them though. There are plenty of Tutorials on TDH for making your own items.
I hope not to offend you, but I somewhat feel somewhat insulted that you want a canon costume for $20 a month, sure that's possible, but it would take yeeeeeears (not that it doesn't for those who spend tons of money into these costumes).
When I started my Fett the first think I figured out was that this was not going to be cheap. I got lucky by finding a fully painted, newly visored DP 95 for $51 shipped on ebay, it has a beautiful shape and size, I love it; I could never part with it. My armour, jet pack, vest, gauntlets, etc were all home made. I know you've seen photos of my costume, and the only thing things I bought for that costume were the Jumpsuit, helmet, and Ruffkin gauntlets. My gauntlets were home made, I made them out of cups and trashcanned some pieces on with some ruffkin resin parts; they would have been good for a custom, but I wasn't sasfied. I then decided to replace my guantlets with Ruffkintoy's ESB set, which were $110 shipped.
This costume can be done cheaply, but... For $20 a month for a jet pack you're looking at 15 months of waiting for a $300 pack, that's over a year.
Just how old are you? If you are under 18, then I suggest you take your time in building a costume, remember, if you are under 18 you can not join the legion. You're in the Illinois area, so perhaps you should go to
www.501st.com and find your nearest GML, and talk to him about joining the legion.
I also see that you would like a Red Royal Guard helmet. I would recommend that you take that on first, it would be a much cheaper/easier costume than a Mandalorian, one of those helmets won't be cheap either, perhaps $100.
Perhaps you could attempt to get a job, or do you have a birthday near by? Christmas isn't for another 8 months. I could understand if you're in a poor situation, but here at TDH we supply what we can at prices we see fit. We post photos of templates for you to build your very own pieces, but we can not just hand out a complete costume for you at a price that would be much less than its original value.
I understand that money doesn't grow on trees, but perhaps if money is a problem, perhaps this hobby isn't for you?
I know that you are dedicated to this site, and I hope that you get a nice Mandalorian costume going! I've always loved the Mandalorians, and I hope to see yours become one of the better ones, but you have to pace yourself. You may know how to swim, but the channel is 26 miles wide.
uke I just got done putting giant scratches and shattergun blasts in my armor. 
