Getting custom motorcycle kits is just the beginning of the whole process.

 One thing you should understand that these custom motorcycle kits do not include the tools required to build the motorcycle. So buying a good set of tools is a great idea.

A set of instructions or user guide will also be included in the custom motorcycle kits. You must read and fully understand all the instructions before you start building your custom motorcycle, if you fail to read the instructions, you might miss something important that could cause your custom motorcycle might not work properly.
You should not expect to assemble your custom motorcycle within a few days, unless you are a mechanic, the fixing time of your motorcycle will take maybe a few weeks or months even though you have all of the instructions and needed parts. The assembly period however will reward you with a custom motorcycle that is unlike all the others motorcycles that you see on the road.
Custom motorcycle kits are a great way to release your inner creative abilities and you can explore your sense of design and aesthetics by adding personal touches to your custom motorcycle to makes it more personal and more unique, maybe some fancy accessories and custom paints jobs or speakers and sound system, or even flashy neon lights.  And of course, there are those who prefer it straight up and simple.
Of course all of these customization will require additional cost outside of the custom motorcycle kit cost. But remember, after all it is all in the pursuit of enjoyment.  Nothing beats being able to ride a motorcycle that you designed yourself, since it is about pride, personality, and identity.
Last but not least, When you have just completed building your custom motorcycle and before you can get out on the road and start tearing up the asphalt and throwing down some miles is to get your custom motorcycle registered and titled.