Welcome to the Quilting Board!
Hi, I have been crunched for space before ;) I used several sheets layed outside on the grass, then placed my layers, I had to be careful to not pin the sheet to the quilt, but HEY it worked great!
huw about a library, they usually have lg tables or a church hall.
How about a senior center or community center?
Do you have a friend with a larger floor area you could use?