Ozimoto builds trikes in-house at our Hua Hin workshop. The donor bike matters, so we do not pretend one universal rear-end kit is right for every Honda. A Forza 350 used around town has a different brief from a machine intended for touring, a passenger or accessibility use.
Before we talk price, we want the useful details: bike model and year, where the bike is now, rider and passenger requirements, whether reverse is important, storage needs, typical roads and your timeframe. That lets us decide what is practical before anyone wastes time.
If you are bringing your own bike, we can assess it as the donor. If you need a complete new build, tell us the result you want rather than trying to specify every component yourself.