I think $150 for all these items seems like a good deal. Subjected to the conditions of these items.
If the question is in filtration, I think the back chamber should provide enough space for medias, for a lightly stocked tank.
What you need to consider is, the small compartment size will limit the Skimmer size. There will a be limited number of good skimmer with footprint that can fit inside, so you won’t have much options.
You need to consider how you want to pipe the Chiller IN&OUT. Using 1 pump for return and another pump for chiller? If so, does sump have enough space to fit 2 pumps. Or if using only 1 pump for both chiller and return, you may need a stronger(bigger) pump, then will the bigger pump fit inside the sump?
Best you look at the dimensions and check what equipment options can fit inside the sump and if you are comfortable with these options.