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If they've replaced the curved frames on that house it strikes me as a good price.
Non-standard, bespoke construction isn't cheap and with something like that where small mistakes will be amplified and stand out like a sore thumb the manufacturer will have to factor the potential for fuck ups and re-dos into the price.
If the glass in the frames was curved as well the price would have been truly eye watering.
Lolololol. Seriously?