Question: What are the differences between "pre-built", "pre-cut", "outdoor" and "portable" traditional saunas?
Answer:

Pre-Built (Modular) Saunas come in modular insulated panels that are assembled together to form a fully functional room.

Pre-Cut Sauna Kits require that you frame up your own walls and provide your own insulation. Tongue and Groove boards from the kit are provided to attached to the inside framing of your room.

Outdoor Traditional Saunas are exactly like a pre-built's in addition to having a roof package option.

Portable Traditional Saunas are small modular rooms that are capable of plugging into standard wall outlets (15amp or 20amp).

Question: Does the Catalina Sauna come with stainless steel hardware for the door to limit rust?
Answer: No, but you can upgrade to the FRP kit which would include stainless steel hinges for door, outdoor electrical, and an outdoor lightswitch.

Question: What is the floor made of on the Catalina outdoor sauna.
Answer: The is no sub floor in the Catalina outdoor sauna or any of the other outdoor saunas. You need to provide a water proof level pad. A removable Super Dek matting will be provided for the walking area on the inside of the sauna.