I've posted this info many times, but new readers keep coming along so I'll do it once again. I have plans for RPG-style diffusors (three kinds), Argent Room Lens clones, and now a really cheap fairly good isolation platform, and more advice than you'll want to hear on passive preamps. If you get in touch, I'll email whatever you want to you. For the DIY projects, you'll need a table saw or equivalent.
Are you a D.I.Y?
I like to "do it yourself" on many items where I feel I can achieve good results and save money. Also, there is some satisfaction and pride in researching and building things, especially if it's your own design. I would supect that there are others on Audiogon who feel the same. If you "DIY", tell us about your ideas and projects you made that you had success(or failures) with. And would you DIY again?