Been there, done that Dave!! My last reef setups were from 2005-2008, I then transferred to South Carolina (for work) and had to sale off everything. I promised myself to do things different the next go round. It took some mad skills to convince my wife to let me dump a ton of cash into this hobby again, but even she now realizes that it was money well spent. An oversized stand is so key to your happiness. I can't wait to see what you end up doing, you will thank yourself later! $450.00 seems pretty pricey for a stand, but if it's a high end, quality build, it could very well be worth it. I built mine and of course, I had sold off most of my power tools prior to the SC move a few years back, so I had to load up the Menard's card lol... I spent $500.00 easy on tools and lumber, but I now have the capability to build future stuffs!
If I didn't have to buy tools, I probably would have spent around $200.00 for lumber, stainless steel screws, primer / paint, etc. So if you look at it that way, spending $450.00 to save you the time and / or headache of DIY, could very well be worth it, especially if it's a nice quality build. One thing I did is make the depth approximately 6" deeper than the tank. I finished the area behind the tank and it's barely noticeable, but those extra 6" underneath are AWESOME!!!! OHH, I forgot... I spent another 100 bucks or so last week for some pocket hole jigs and euro-hinge guide / jig, to build my doors. I'm going to have a 6" x 3/4" border and order some custom glass inserts. So I guess I spent $300.00 or so for my cabinet in all.
I think your fuge build sounds very legit, I wish I had a way to slow the flow down a bit, much like you will have. I ended up putting chaeto and the red macro that i received from IPSF.com in an old container I had laying around. I built it up on stilts and the rim has slits, so the flow comes out much slower, but it's rather ugly.
I'm also going to be building two smaller "covers" for each side of my tank, one will just cover the left side of the chiller and allow me to set something decorative on top of it and on the right side I have the 6 gallon blue reservoir with the ATO pump velcro'd, that I will cover as well and sit a plant or something on it. So at that point everything will be hidden.
When you do your return, will you be able to set up a "herbie style" drain? I highly recommend you incorporate it in your build any way you can, if it's feasible. You will thank yourself a million times over. The durso stand will almost always have gurgling and bubbles and Herbie or beananimal's design wont, or shouldn't. Then you could potentially be able to put all your equipment back under the hood and out of sight! It's the number one, hands down, best thing I did for my tank.
I'm following your build, look forward to your changes and of course, you grinning ear to ear afterwards!