You're going to be so happy you built that walk board. I did something very similar with my in-wall build and it has been absolutely critical as my stand is 41" tall... and I'm only 5'9". :0)
It does make a lot of sense,especially when aquascaping. I do have a little flex in the support rods so I will have to build up my confidence a little..or maybe throw a 2x4 under the walkboard
You can possibly do some kind of fold out 2x4 so that when you pull up the cat walk it would extend the 2x4's as well, giving you the added assurance that it is sturdy. May not be necessary, but just throwing it out there.
epic house and tank! Is that structure on the right side a garage?
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...I don't know why everyone says its so hard!