Re your trellis: Eventually, you'll have to add heavier verticals to support the structure. Horizontals can be fairly lightweight. The vertical supports have to be very substantial, however. Commercial growers use steel wire for the horizontals, but use heavy anchored posts for the vertical supports. Think along those lines. There are many. many 'systems' to train a grapevine to a trellis or other structure. One 'system' might work best for a particular variety and another system might work better for a different variety. Grapes are very adaptable, however. As long as the vines are getting enough sun and they are pruned correctly in the spring, you can usually adapt them to just about any structure that is strong enough to support them. Good luck with your grapes.

I have just discovered that the yardlong beans I planted as an experiment have gorgeous, lavender, orchid-like flowers. In your zone some plants that are annuals in the north may be perennial. Consult your local ag agent and see if your local community college has a master gardener program -- either could give you detailed information specific to your area. Unless you have family members who are allergic to bee stings or are dealing with the africanized type, bees aren't as big a deal as people think they will be. Most bees that are busy working abundant flowers are not at all aggressive. I can harvest cucumbers and inspect squash for squash bug eggs with them buzzing all about. They just move with the flowers as I shift the vines. :-)

Some sources warn against confusing moonseed, Menispermum canadense, with grapes. Moonseed is very poisonous but has only a single distinctive crescent moon shaped seed in each fruit. I think the plant looks very different than a grape.....but it really depends on how familiar you are with wild plants. Check and make sure you can tell the differences. Wild grapes have more than one seed in most fruits and they are not shaped at all like the seeds of the moonseed plant. Here is a link that might be useful: Moonseed drawing, etc.

I can't give you advice on Teas but your arbor is lovely!