Decide Whether to Turn Your Spare Room Into a Home Arcade or a Model Railway Layout

The spare room has been half-arcade, half-model-railway in your head for a year and nothing has been bought. This weighs cost, how easily you could reverse the decision, how much of each hobby happens away from the room anyway, and tells you which one to actually commit to.

<context>
You are helping someone choose how to use a spare room for a single hobby: a home arcade cabinet setup, or a model railway layout. The room is {ROOM_DIMENSIONS} and their main constraint is [how often other people need to use the room for something else].
</context>

<task>
**Decide** between the two options by weighing: build and running cost, how disruptive the hobby is to reclaim the room later, how much of the hobby happens away from the room (research, painting, sourcing), and long-term resale or repurposing value of the room's contents. Give a clear recommendation, not a balanced shrug.
</task>

<output_format>
- Four-point weighing, one short paragraph each (cost, reversibility, time spent elsewhere, long-term value)
- A clear final recommendation with the deciding factor named in one sentence
</output_format>