I think you are on the right track here. If you are set with a button ante and 1000 chip set then the break down is easy imo, get 900 workhorse (or "unit" in your terms) chips and get 100 color up chips, ideally with a 20x value to make it easy to swap chip for barrel.
When considering limit structure, you want to focus on how many chips in the small and big bets. If you hear someone referring to "two and four chip" or "three and six chip" that is what they mean. Here are examples.
Two and four chip limits
1/2 if played with denom of 0.50.
2/4 if played with denom of 1
4/8 if played with denom of 2
Three and six chip limits
3/6 if played with denom of 1
6/12 if played with denom of 2
15/30 if played with a denom of 5
And so fourth.
If you always do at least two and four chip structures you can always divide the small blind/bring in as a single chip. If you do three and six chip you would make the small blind either one or two chips.
You could in theory do one and two chip structures. But then dividing for the small blind and bring in become issues and the chance of misinterpreting single chip bets goes up.
As for your stud structure I think it's fine to just a small bet on the button and a force of half that value. That's pretty standard. If you want to drive action, double the ante

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So I think that breakdown works pretty well for two and four or three and six chip structures. If you want to do four and eight chip you might want to either expand the set or dedicate another rack to color up chips.
Hope that helps. I think we're saying most of the same stuff. I am just avoiding the use of fractions since the numbers can represent anything.