As
@BGinGA already pointed out T100 is not analogous to T1. I see this misconception a lot on PCF. If you divide T100, T500, T1000, T5000, T25k by 100 you get T1 T5, T10, T50, T250...those last 3 denoms do not exist in most chipsets.
I have only run a few casual tournaments, single table, but 2 of them were base T1. And they were a blast. I was (still am) a total noob in running tournaments, but in the event it is helpful, here is how I structured it.
I used T250 stacks of 15/12/7.
This structure has multiple big jumps, which is normally not advised. (I did not know any better). But functionally it worked well and is kind of like 3 mini tournaments in one:
1. Play for an hour as base 1 with 20min levels of 1/2, 2/4, 3/6. Then break and color up. This break is only chance to rebuy.
2. Play again for an hour as base 5 with 15 min levels of 5/10, 10/20, 15/30, 20/40. Then break and color up.
3. Play again for an hour as base 25 with 15min levels (25/50, 50/100, 75/150, 125/250). Break. No color up.
4. Then 10 min levels of 200/400, 300/600, 400/800, etc. till game over.
I think this structure was easy for noobs to conceptualize and gets them used to T5 and T25 base structure as well. And a few 100s make it to the table during color ups.
Games were over around 3.5 hours (perfect for a bunch of working dads needing to get home before midnight and to work next day). If you want the game to go longer just add more 25s to the starting stacks or allow add ons.