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I forgot to add the pictures!! I can't figure out how to go in an add them after posting, so I'll post again!

Generally when you pot or reports plants you want to give them a lot of water at first. Succulents are opposite, they will rot with too much water and establish roots best when kept on the drier side. When bits of my succulents fall off, I simply stick them in sand and do not water them until they sprout roots

Staghorn Fern or even a Vanda Orchid would be lovely.

Here are some links with more information.

https://www.gardeningknowhow.com/ornamental/foliage/staghorn-fern/staghorn-fern-information.htm
https://www.gardeningknowhow.com/ornamental/flowers/orchids/vanda-orchid-care.htm

Rabbits do occasionally feed on Echeveria plantsre, but squirrels seem to like them far better. Here are some articles on managing these animal pests:

https://www.gardeningknowhow.com/plant-problems/pests/animals/keep-rabbits-out-of-gardens.htm

https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

As for winter care, you can cover the plants but the main thing is that they remain dry. If possible, however, it's normally recommended that you pot up Echeveria and overwinter indoors.

There is no way to calculate the time that it would be for propagating a succulent, except it will take quite a bit of time.
Though it is fun and cost effective to propagate plants, if you need specifics I would advise purchasing the plants. You can purchase these small succulents in bulk very easily. You could then care for them with your grow light system prior to the event.
Just to give you a time reference, I have been propagating some succulent leaves that were gifted to me in May; it's now mid August and I have time 1/4" little buds on the leaves.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/propagating-cacti-and-succulents.htm

It seems the easiest way would be to outline the shape, and plant within the shape. If you have enough plants to fill that out, then it will be easier. If you do not, then plant them evenly spaced, and continue to prune the plants until they fill out. After, keep anything that falls outside of the boarder trimmed off.