Picture of How to build a custom bike
i saw a add (http://www.dreambike.com/home.htm)recently for custom bikes online and i thought i know how to do this to bikes i already own so this is a great project if you have alot of bikes lying around you could make a nice mountain bike to take a long stroll through a nature trail or a BMX bike for jumping and heavy use many great ways to enjoy the out doors 

1. Old bikes
2. Assorted Allen wrenches 
3.hammer or mallet
4. Flat head screw driver
5. Wrenches 
7. Primer and spray paint of your choice 

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Step 1: Taking off the wheels And Seat

Picture of Taking off the wheels And Seat
This process is very simple all you do is loosen the two outer bolts and the front tire will slide right off, the bike tire will be free but you need to take the chain off the sprocket allowing space to get the chain off the tire, the seat you either flip a lever thing or loosen a couple of bolts then the seat comes off if you use a hammer you can tap on the clamp and it will slide off

Step 2: Taking off the chain

Picture of Taking off the chain
All you need to do is find the master link (pictured) and use pliers to pop the clamp off and the chain will come off the frame. CAUTION do not lose the link

Step 3: Taking off the handle bars

Picture of Taking off the handle bars
Another easy step, all you do is find the right size Allen wrench and loosen the bolts(normally 4 bolts) that are pictures on the gooseneck

Step 4: Taking off the brakes/gear changer

Picture of Taking off the brakes/gear changer
Brakes aren't always needed in BMX but I suggest having them, to take them off loosen the bolt that are part of the braking system, and they'll come right of, its pretty simple. For the mountain bike it will typically have gears up have to use the same size sprocket system that's set up for your gear ratio pretty complicated I suggest leaving it the way it is, for more info on gears check you should check out YouTube vids and google it
This looks awesom