Burda Style For people who sew

If anyone can offer any advice..I’m building a cocktail dress to wear to a friends wedding with a corset bodice. It is mainly inspired by this dress I saw at a local gown shop but is only sold in sizes 0-6 >( so I’m taking the opportunity to ‘grow it up’ a bit so it’s more fitting for a early 20’s young lady rather than a homecoming dress.
What I want from this dress: strapless, sweetheart neckline, slight corset effect to enhance the bosom and nip the waist to enhance hourglass shape, and Support Support Support so I can dance all night long at the reception as well as the after party, but still sit through an hour long ceremony in ‘relative’ comfort, also, broke my neck and have stenosis, and disc problems so making an absolute corset completely out of flat steel is kind of out of the question as it will mess up my spine… so I’m thinking spiral steel all around except maybe 2 flat bones in the front? Any thoughts?

But, my real quandry is that I am a 38DD+ and have difficulty fitting garments to my bust. I want a sexy wasp waist but support in the bust. And something that will flatter my endowments and make my husband proud…and perhaps a bit weak in the knees =O
-So, should I do an underbust corset and then attach cups? Or will this not lend enough support to the bust, as it will be strapless so I don’t want the tops of the cups to gap away from my skin.
-Or would I be better served creating more of a corset/bustier hybrid and make an overbust corset w spiral steel and place cups inside it to give a guiding shape for the bones of the corset to follow?
-Or, it appears in the photo as if the boning goes up to the underbust but then stops to allow for a cup, and in my case, an underwire.
Here is the inspiration dress:
http://www.google.com/imgres?um=1&hl=en&safe=off&client=firefox-a&hs=MUh&sa=N&rls=org.mozilla:en-US:official&biw=1366&bih=610&tbm=isch&tbnid=WkPaQFXgmDVM1M:&imgrefurl=http://www.queenschoice.com/inc/sdetail/sherri-hill-prom-homecoming-dress-1403/10849&docid=ZBRkc3zzVCcpsM&imgurl=http://pi.b5z.net/i/u/1627444/i/Sherri_Hill_1403_Royal.jpg&w=543&h=748&ei=lhALUJKHJsmgrAG9uM2jCg&zoom=1&iact=hc&vpx=794&vpy=116&dur=8295&hovh=264&hovw=191&tx=117&ty=142&sig=109698960312750769276&page=1&tbnh=137&tbnw=109&start=0&ndsp=29&ved=1t:429,r:6,s:0,i:94

Thanks to any and all advice and assistance =)
Cheers!

p.s. this is what I DONT want my bust to look like: http://butterick.mccall.com/b5797-products-22969.php?page_id=916

Jul 22, 2012, 07.10 AM by pinkdaffodils