What to do?

We have a wonderful greenhouse with a stone knee wall with a wood frame. It was originally fitted with glass. Since there are several large tree limbs above the greenhouse we have not replaced the glass. A while ago we covered the greenhouse with greenhouse plastic film which needs to be replaced.

The suggested solution is an aluminum roof system with a double walled polycarbonite sheet material. But . . . we do not like the look! What to do?

Any one have suggestions?