Instructions are available on  
"How to build a Drum Enclosure"
These are very detailed instructions describing various ways to build the enclosure,
included are the angle patterns of the wood pieces on how they are to be cut,
  the  list of materials you`ll need to purchase,
where to purchase the specialty items (sound panels,plexiglas connectors etc.)
many photos and diagrams are included ,
The instructions are 47 pages.
It also would be useful if you have someone available with some experience in basic construction.
Prices of materials can fluctuate often,so the prices shown are a rough estimate to at least give you some idea as to what it can cost.
To build the drum enclosure the same as the one we built $2500,
A free standing enclosure(one not attached to a wall) $2750,
Also we designed an 18" tall wall that would go around the bottom of the plexiglas walls to have more control over the base drum sound that would add $310 to each design,
if you are building a drum enclosure that already has a ceiling, such as in your home , you can deduct approximately $230 from the cost.
If you have any questions, technical support is available @ 1-812-584-2554

Instructions are $79.95 to purchase, payment can be sent through a Paypal account to [email protected]  . I will email the instructions to you.