There is always a way to make them look better or make your own.
It really comes down to how experienced or talented are you at various skills. If you're up to the task of using green stuff, infinite possibilities exist. Most of us are not that great with it, though, so that limits things a bit.
Personally, I liked the older rangers and didn't think the new ones were much different except the cloaks are more squared and billowy and the different heads. Converting metal is always a bit tougher, though, but some work with a file may alleviate your problems or some green stuff to change a few shapes would work well. Some head swaps with the more modern eldar plastics might help along with file work to clean up the cloak edges and the like. You can always file at green stuff to overcome any deficiencies there.
To make new rangers, I always thought I might just take some guardians, convert the guns with some plastic tubing and a lot of cut work with some filing, and then just sculpt new cloaks onto them with green stuff but it seemed like a lot of work for a unit I hardly ever use and cloaks/cloth can be hard to sculpt well. I've made trench coats for my Orks before, but there isn't really an expectation of clean lines and all that with Orks. =) However, if you're interested, you can basically make that sort of thing by applying flat pieces of green stuff and kind of pushing it around all the parts and then going back in and detailing it all out by pushing and pulling the sheets of green stuff into a semblance of cloth flowing around them. After it dries, you can use a blade to cut all the cloth bits into straighter lines to get the edges better as well.
Just some thoughts...
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