Was this structure homemade? That is, did the owner of this kiosk construct his business without much outside influence?

Was the kiosk constructed with insulation in mind?

Were the mobile, insulated panels added later as a response to inefficient (or nonexistent) structural insulation?

Is the structure more prone to temperature fluctuation due to its unique position on the site? It is elevated for mobility purposes, which allows air to pass underneath the entire structure at all times.

Does the presence of single-paned windows contribute to indoor temperature fluctuation?