I do not have any EW experts, so I do not have good lasers.
I have a good 60% Missile/Kinetic guy, so I try to build my defences around missiles(railguns are way to short-range right now). The main idea of my missile corvettes can be described as:
1. Several largest commercial drives. To split the risks and cut on fuel costs.
2. Lots of small launchers.
3. Lots of small FC.
4. one large active scanner for ships, one small scanner for missiles(just in case).
5. Several shielded magazines.
6. lots of crew quarters, lots of engineering, lots of small fuel tanks.
7. size-3 ASM with warhead yield of 4. size-1 AMM with warhead yield of 1.(just in case).
EDIT:
8. 2 CIWS systems.