One of the benefits of building your own aircraft is the ability to equip it exactly as you wish. Van's Aircraft offers a number of options that allow you do this. While many components can be added throughout an aircraft's life, some are best installed during the construction process.
The RV-4 holds two people and a moderate, but useable, amount of baggage. The seating is compact, but still comfortable. It is flown from the front seat only, but the kit includes a stick for the rear-seater so he or she can share the fun. It is designed for engines of 150-160 horsepower, although engines as small as 125 hp and as large as 180 work well and are commonly installed.
Canadian Aviation Blog
Friends of the RV-1