Two questions I had is do you know how much it costs to install one of the hoop houses and what happens after the 5 year period?

The prices vary depending on size and type. The grant's pay back of $4.60 per square foot is over double what they go for. We're looking at http://www.zimmermanshightunnels.com/ and these specs seem to be pretty reasonable nationwide.

After the 5 yr period, the grant period is over and there are no rules. You can bring in tables, grow in hanging pots, etc.

Do they still continue to come and checkout the hoop house?

Nope. Your contract is finished!

:D