Hi There!
Sounds like you have most of the bits to get going on this project, there is one important thing missing though and thats the Accelerator card.
If you want to use the BVision you'll need a Blizzard PPC, although I'm sure you are aware of that. If you don't want to go to the expense of getting another one (they fetch silly money these days) then you could always sell the BVision and buy another Accelerator like an 030/040 board.
I'm guessing your case has LED's on it, Amigakit sell a simple adapter to wire these to:
http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=718Although not essential for the Amiga to boot they will give you an idea if anything is wrong.
You can hook up a HDD & CDROM to the the internal IDE but if you do I'd suggest a 4Way Buffered IDE device.
The DCE Scan/Flicker Magic you have will let you hook up and LCD Monitor but the picture isn't that great, they are much better solution if you use a CRT Monitor. With LCD's you'll get in most cases faint vertical lines.
Other then that it sounds like you're good to go!
Best of luck with the project.
Steve.