Thats a good question. A good start would be to look at the Envelope Systems I built here 
(slight plug)
I think the biggest difference between yours, the savings budget, and mine is I base my envelope values on the actual income and money in my accounts, and not the potential money that I have in my planned budget. Meaning, while I expect to get paid twice in a month, I cant add the money to the envelope until it hits my bank account. Yes I can plan for it in my budget, but it isn’t marked as available until payday. slight difference but a mighty difference. Which is great. I think the value proposition of Tiller is its ability to work with so many sheets and ways of doing personal finance.
Overall, I think what you are doing in all of your sheets is awesome. Keep it up.