Have a look at this website. You'll probably find what you need there.
You can google the two main manufacturers of project boxes, Hammond and Bud. The boxes do not come pre-drilled, but you can actually buy a five sided box from Hammond and have a top plate custom made to your specs from front pannel express. You can go very fancy if you want.
And yes, you have to be careful with your iron so as not to ruin the transfomers, but lots of people make their own enclosures. It's not rocket science and about as easy a project as you are likely to find.
Good luck and good listening.