How are you going to power all of this? Single group espresso machines draw enough that 2 on the same circuit will trip any conventional breaker, and most, if not all, commercial machines take at least 220v, and draw a bunch as well. You'll also need to figure in refrigeration (milk and cream) as well as work lighting. Not to mention that the Citroen is basically a steel box with no insulation, anywhere. Sweltering in summer, freezing in winter. A generator is probably out because of the noise, and not a lot of places have that kind of power available for outdoor hookup.
