That's a beautiful table ... your hubby is handy with wood ... good for the chins!!!
That sounds like a good plan to me.
Leaping ledges are easy to make ... In one of our older large cages Bill made a set of 7 leaping ledges and placed them in an upside down "V" arrangement that led up to a 'look out' (the 4-sided hut pictured above) attached at the top of a cage ... the chins seemed to love that. However you place the leaping ledges, just space them equal distances apart horizontally and equal distances vertically, something similar to this: (but with several bars between each level)
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Be sure to get PVC pipe that is at least 5" in diameter ... chinchillas grow fast and you don't want them to get stuck inside of it. PVC pipe can be easily cleaned and can even be placed on the top shelf of the dishwasher for steralizing it.
Did you notice the cute PVC pipe wrapped with rope "Chinchilla Gym Set" on the same site?
Wood shelves can be cleaned with a hand vac daily. When stained with urined or mashed poop, it's best to take them out, use a vinegar and water solution, let them dry completely, then use some sandpaper on them. (Good idea to keep a complete extra set on hand to allow plenty of drying time.)
Jo Ann