Yay for bringing lunch every day. I do too, and I also do not have a microwave to use; although I don't know about Fat Smash particularly they are all heavy on the veggies/fruit and low on the bread/starch/rice. I get a lot of ideas from Bento blogs and the Laptop Lunch blog. Lots of the actual bento lunches are pretty calorie heavy, but they show you how you can pack all the "courses" together appealingly into one larger container.
Some ideas:
1) For bringing lunch every day, you deserve a special container. Look for ones that have good latches/seals and don't leak. That was what really got me out of the habit of using recycled plastic containers and baggies -- a few too many lunch bag explosions. Buy a couple of nice Lock 'n' Lock containers in different sizes and use the recycled containers in the fridge for preprepped stuff.
Also some icepacks in different sizes are handy if the big one is a problem, you can get little flexible ones that you cut from a sheet.
2) Seconding (thirding) cutting vegetables that you can just grab out of the fridge in the morning. If you don't have time to cut them all at once (I usually do them the afternoon I get them home from the store), at least do a few extra the night before you're making the lunch. I never peel just one carrot; if I have the peeler hauled out I might as well peel five, and the remainder go in a plastic container in the fridge.
Buying them already pre-cut also saves time though they can be more expensive. I also can't get too many things pre-cut here where I live, so lots of peeling. Put some nice music on and a glass of wine (or whatever you are allowed on FS) and snip snip snip...
3) Yay for hubby eating healthy! Buy some extra fruit and veggies to account for his consumption and give him his own special section in the fridge which is "safe", or keep a section which is Off-limits, for lunch packing only. Make him peel to make up for it.
4) Are you allowed wraps (fat free) on fat smash? There are some tortillas and wraps that are non fat or low fat. Some stores keep them in the refrigerator rather than the regular section. You can put all the regular sandwich fillings in. Also you can wrap things in lettuce leaves, especially the soft lettuce like buttercrunch. And rice paper wrappers in the Asian section of the grocery have no fat, although they need a little practice to work with. They are stiff round sheets that you dip in water and then they get flexible. You have to make them that morning though, or they get too soggy and fall apart.
5) bean salads made from canned beans are great. Make sure they are no-lard or no-fat, and google bean salad recipes.