supprort for more pre_terrain

[TheGoatGod]

#Is your feature request related to a problem? Please describe.#why
to make json less congested with less entry's of the same

#Describe the solution you'd like
I'm not sure how this would be possible I'm sure its hardcoded
id like to be able to use at least 2 more pre terrains (optional)
"pre_terrain": "wooden_frame", "plastic_frame", "metal_frame", but it probably would need a few [] or {} (I know there isn't plastic frames or metal)

#Describe alternatives you've considered
using the current method and congestion json files

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