The viperjet is a pretty cool plane, but probably not something that falls in the category of homebuilds that a single average person can built themselves in a few years. And to my knowledge not produced anymore. Itís more in category with L-39s and the operating costs are very much higher.
What is interesting about this jet from Sonex is that itís coming from a company with a concept similar to Vans. Simple sport airplanes of aluminum constructions in the experimental market that can actually be built by a single person within a reasonable amount of time. While Vans concept is simplicity and keeping cost down its not really how many RVs are built anymore. Garmin flatscreens, C/S props, fancy paintjob, leather interior ect. I bet many RVs are north of 100K$ before they every roll down the runway.
RV-8 QB - status: flying.