Anyone recommend a lockable steel gun cabinet for knife storage? Due to structural concerns, and the prospect of carrying it up two flights of stairs, I am not interested in a heavy fire safe. 
I've been seeing these Stack-On cabinets at some of the local sporting good stores. I assume they can be bolted to the floor / wall. They have some sort of locking mechanism, and are available in a few different sizes and configurations. Are they worth the money? Is it difficult to gut the factory interiors to make space for custom shelves?
Recommend a different brand or different style of cabinet?

I've been seeing these Stack-On cabinets at some of the local sporting good stores. I assume they can be bolted to the floor / wall. They have some sort of locking mechanism, and are available in a few different sizes and configurations. Are they worth the money? Is it difficult to gut the factory interiors to make space for custom shelves?

Recommend a different brand or different style of cabinet?