>Do you have to space the 705 at least 1" from the front of the fabric ?<
No the fabric right on the face and back is fine.
>Is it all right if i put the air filter in front of the fabric ?<
See above.
>I can close the back panel with fabric ?<
See above

>Should I put something in between 2" panels of 705 ?<
No just put them together to make a 4" panel.
Glenn