Simplicity: It's not that simple!
I know you are super tight on your budget and I know you have probably heard of or have used those window insulation kits with the plastic sheet and the double sided tape. Since your window is so large you might want to use a clear painter's tarp and some tape and at the end of the winter season gentle pull the tarp off and save it for next season. Just something to think of since weather is getting cold here in western PA too.
Then you get a little bit of the view and no draft (I did it to my window a few weeks ago)
That's a great idea with the painter's tarp! The insulation kits, for the amount I'd need, were outrageous but this would be far more do-able!Thank you!~ D