Gday Simon and welcome.
Bottom line....youre crazy :) to go into buying anything used and intangible as in off internet "auction" sites. Youve just told us you dont know how to use a machine...let alone go buying someone elses second hand problems. Not trying to be offensive...helpful actually *:)
Forget the "bargains"(?) people reckon they get off websites...theyre *only good to people that know what they are looking at, & have the capability to recondition as necessary and find & replace parts needed.
I suggest you contact Bo_Ema direct. They do have small volume commercial 1 group machines with a tank in the body although they are not common, and you never know they may have something used in stock that they will GUARANTEE is complete and working so that you can take it from there. They may even put the sale through their Vanuatu agent so he can guarantee and service for you......you will never *;)ever know if you never ever ask!
The other way of course, is to buy a new machine to suit your needs from the multitude of machines available (including mine) simply making sure the KISS principle applies. Your Boema techi in Vanuatu shouldnt have a problem if he can work (successfully) on a Boema.
That of course opens a can of worms for you because it will start a round of so called "research" that will make your head spin until the final decision is made. And if you buy a new machine.....you should be way ahead of a used machine in the reliability and serviceability stakes for a long time to come. *
Hope this helps and good luck.
very first CS ste sponsor.