Hydrogen peroxide is so safe I would say use it as often as necessary. I use it in my pond on a regular basis with no harmful effects to fish or plants. I watch for signs that algae is starting to grow and add as needed. I find if I wait too long it's a bit more difficult to get rid of the algae again.

Any comments on inspection from the OP? Not anything I can say from personal experience... yet. This project is the first change to the electrical since we moved into the house, so no one but the purchase home inspector has looked at it and told me anything. While he was not an AHJ, he didn't say anything about it. But I'm not sure that's worth much. I'm assuming it did pass an AHJ inspection when the house was built, or if the previous owner(s) had any work done. (The house was built in the mid-80's and we moved in about 8 years ago.) We all know what assumptions are worth. Will update when we do get an AHJ inspection.

Lavender, can you post your layout again? The hardest things to deal with in a reno are the things you're absolutely certain you want in your kitchen, that you really just can't get to work out. You find creative solutions that include splitting atoms, until one day, while researching the proper disposal of spent Uranium, it finally dawns on you that you can just change your mind about what you want. This may be one of those things. A 36" pullout base cabinet is a much more functionally important piece in a kitchen than a cart that rolls out of the way (that already has wheels on it, but you don't want to store out of the way) - really. Maybe you can re-fashion the drawer space above the pullout to house a retractable butcher block board. But as nice as your cart is, there's no way it can do for you what that base cab can do, and storing the base cab in the laundry, well, if you think that will work, then maybe it will. Whatever you want, I hope it works out. Just remember, you cannot change the laws of physics, but you can always change your mind.

Here is quick guide if you want to DIY: An easy way to make sure the posts are level with each other is to measure using an X pattern. Like this: Where ‘I’ = a 4x4 post and a,b,c, and d are the ends of the posts. a b IXI c d Place your level from end a to d and then from end b to c. Remove or add dirt until both are level. Since you are burying them down about 3 inches below the surface first dig the trenches, lay the posts in and then sit the same size food can at each end of the posts. The cans will make sure your level doesn’t touch the ground. (Use tall cans) Purchase 4 stainless steel bolts, washers, and nuts. Size of the holes you will drill or that are already there will determine the bolt size and drill bit size. Drill holes in the arch if they are not already there. Keep distance the same for all 4 holes. These holes will determine the center line of the posts you are going to attach to. After leveling the posts, remove and drill holes that match the arch holes. Insert the bolts, washer, and nuts with the nut end of the bolts sticking upward. Lay the posts back into the trenches . Remove the nuts, slip the arch down over the bolts, replace the washer and nut. Tighten same. Cover the posts with dirt. By the time wind blows hard enough to pull those posts up out of the trenches your house will be leaning over….. lol