The Hot House base mode is a Fire Station. It's built to the same configuration as two of the other bases with a Micromaster base ramp connector on the front at the right and another on the left of the base. Most of the base is moulded in red plastic, including the building on the left which is topped with an orange training tower. On the right is a blue garage with an orange fold up door. The garage would accommodate many Micromasters but the plane supplied with it has a wingspan that's slightly too wide for the width of the door.
Transformation: fold the garage door up, then fold both the garage & building forward. Fold the revealed panel that was under the buildings back, and fold the cannon out from inside the tower.
The Battle Platform mode is virtually a tank - complete with cannon and moulded tracks underneath. The only thing it could do with are some wheels on the underside. The garage forms a control centre for Hothouse to stand in. Almost uniquely amongst the four Battlestations, Hot House can still use Micromaster base ramps in this mode - you can attach a ramp to the connectors on Iron Work's tower but they're a little high up to actually reach anything. In fact both of the connectors for Hot House are at the right level and orientation to be connected. Quite ironic really that the only Battle Station that looks mobile can be connected to a building !
Decent base & decent battle station - well worth a look.
Hot House was sold in Japan under the same name as Transformers Zone toy C-434. An identical Battle Station with the addition of some PVC figures but without the Micromaster was sold as part of the Brave Police line in Japan.