Portable isolation booth...

I am currnetly recording in a temporary place. I am not going to do any construction on this place, but i would like to get an iso booth built that can go with me when i get a more permenant location. I want to build it in the corner of the room, and i want to be able to fit 1 person in there with an acoustic guitar. I looked at a lot of the sites that offer them pre-built, but i dont have the money to put $3K into one small room. It does not need to be 100% sound proof, but as much as possible on a small budget (around $700). I was thinking of a room in the corner, and has a small window so i can see in and the artist doesnt feel too closed in. I will need some way of getting cables in and out of the booth. Any and all ideas welcome. Thanks Jason