Our simple gate was made from weathered old boards salvaged from the dump. We placed a measured and cut piece of rabbit wire on top of the square frame and stapled it in place before adding the diagonal wood board on top for support. Finally, we added a latch to hold the gate shut.
The garden itself seems to be doing fine for now. Last week we had several very cold days, including at least one frost that was not great for the tomatoes, but this week we've seen a string of sunny 90 degree days and the plants seem to be perking up. Apparently early June is the best time to plant most of the delicate veggies (at least in our zone), so we may have jumped the gun by a week or two. A few plants may not make it as a result, so that is a lesson learned for this year.