I'm glad to see another Medium bus owner. I don't own, but I have driven an IC-CE. They are nice and run well. My first suggestions are the basics for buying any vehicle, check oil, coolant and other engine fluids. If your bus has air brakes or an air system, I would check for air leaks. Your bus is new enough to assume it has DEF and DPF. I would do a little research on how to service those systems. I can say from my experience with a nearly 27 year old bus that rubber don't last forever, my bus had crunchy coolant hoses and still has an air leak on the driver's seat. Your bus looks great and I hope it serves you as an amazing project and vehicle!