1) Ohhhh, those black and red 10 centers above...
2) By loose or nitty play, I was referring to how crazy or conservative your players are with their bets. In some 1/2 games, the standard preflop open is $5-$7, in others it’s more like $12-$15. In some games, people get all in constantly; in others, a shove is a rarity. So I was suggesting: Your chip breakdown would be fine for a loose 1/2 game, but a little short of $5 and $25 chips for a loose 2/5 game. However, that was based on the assumption that there would be normal-ish buy-ins allowed. See below.
3) When I posted, I had not seen that you were projecting buyins of just $20, and might limit people to 2-3 buy-ins. As others have suggested, your chipset is really not suited for a group whose players only want to buy $20 at a time. You should either increase the max buy-in considerably for 1/2, or add some chips with smaller denominations and play lower stakes. Even if you got a lot of quarters ($0.25 chips), at $20 that would only allow someone to buy in for 80 big blinds (BB).
Typical cash games have a min buy-in of 30-50BB, and a max buy-in of 150-250BB. At my nearest casino, the smallest amount you can buy into a 1/2 game is $60, and the max is $300. Almost no one buys in for the minimum, except (a) very inexperienced players, (b) people who didn’t bring enough money to the casino, or (c) “short-stackers” who are exploitatively trying to take advantage of the table... which is hard to do unless you really know what you are doing, and also get lucky repeatedly early on.
Also, it is not common to limit the number of buy-ins at cash, and I don’t see any point to it, unless your crew is full of problem gamblers. In which case... it’s probably better not to host at all.
4) My feeling having played poker avidly for about 12 years now is that a full table of short stacks is not desirable, if you take the game seriously; and not an interesting game for more than one session, even if you are just looking to gamble small amounts of money. It means that you are going to have players going all-in preflop or on the flop almost every hand. It means that no one will have enough chips to play more than a push-shove game until everyone has rebought 3-4 times. This type of game can get old quickly.
You’re free to do what you enjoy, but I would suggest buying some small denom chips to go with what you have, and make the standard buy-in more like 100BB if your players don’t want to spend too much. So if you get a bunch of 25 cent chips, make the stakes .25/.25, and the typical buy-in more like $25, with the possibility of buying in for as much as $50 at a time.