If you have your heart set on a particular bike but you want specific kit on it then this is a great option for you.
With a bike frame you can literally pick your own groupset, your own handlebars, your own unique grips and pedals just to your liking and budget. Most road bike frames come as a frame and forks set. However, a mountain bike frame will often only come as a frame to give you the option to put your preferred choice on it.
When thinking about building your bike then make sure you have the right skills and tools to do the job, if you are not sure how to build your own bike, do you have a bike shop in mind to help complete the build for you? Many bike shops offer this service which will make this process a whole lot easier.