Free Iso Blueprints?

I just donated $20 via PayPal... I use several forums regularly and I understand and appreciate the work that goes into maintaining them. I say that only because my issue is not about money, but "GooglePride". I'm hoping to find free construction drawings / blueprints for an iso booth. I keep seeing the link to the $49 plans at "Project Studio Solutions" but I can't accept there are no free alternatives somewhere. I thought my forum querries were well constructed, but maybe not. It's not that I found plans but they aren't what I need -- I haven't found any plans for anything. Someone must have put up a PDF of their own plans. My budget is around $1,500 and I am sufficiently skilled in construction. A few years ago I helped build a studio in a friend's empty garage, complete with bathroom, double doors, double control room glass at different angles, multiple drywall layers of different thicknesses to address different modes, the whole nine. In the time it's taken me to "find" plans I could have drawn them up (I know) but lo, pride is getting the better of me and I just can't accept that there are no free iso booth plans on the internet. Does anyone have a link to a PDF of detailed, usable drawings for a stand-alone iso booth similar to a "Whisper Room"? If such plans are linked-to in this forum, I humbly bow my head in disgrace.

here's an example i've posted here before. not a detailed construction plan but maybe it helps.