There are three main reasons why people make their own :
1) to save money
2) to "create" something different
3) for pleasure/hobby
(could be a combination of the above)

Seems to me that you main reason is to save money. In this case it may not be so simple.
Frenchie can set me right here, but if you factor in all of the materials you need to purchase (including shipping costs...) , not just the one used , maybe you will find it cheaper to buy a new one.
And of course if you make a mistake , that will cost you money too.
Franco