[Xaero252]

I've tried several cases thus far, and none seem to fit correctly, they are all either slightly too large or just barely too small to fit my 5th generation 30gb iPod video; I have modified it, and replaced the entire housing with a new one recently, modifications include a new battery & 256gb SSD. 
So far I have tried these two cases:
http://www.amazon.com/Griffin-Hard-Shell-Leather-classic-Black/dp/B000VXQZA0/ref=sr_1_1?ie=UTF8&qid=1356026608&sr=8-1&keywords=elan+form+ipod+classic
http://www.amazon.com/Black-Apple-Classic-Aluminum-Plating/dp/B0056BUVES/ref=sr_1_1?ie=UTF8&qid=1356026648&sr=8-1&keywords=hard+ipod+classic+case
Both of which came with 2 size backshells one which was a hair too small, and the other of which was 2-3mm too large, leaving a gap begging for debris to get caught in.
I'd prefer a hard case, as the sticky feel of most rubber cases is very irritating to me, especially since I generally toss my iPod in my pocket and the silicone loves to grip the pocket, and any lint that has managed to stick around. I am however, all ears to any outstanding soft cases as well.
Thanks

 

[DMinor]

Try This case.
 
 
By the way, what 256GB SSD did you use and did you Rockbox it?

 

[Xaero252]

I used the Super talent DuraDrive ZT2 256gb. I had to initialize the drive via windows using a USB enclosure before the iPod video would take it, my iPod classic's boot loader sees it but it won't boot with it installed. And yes, its rockbox'd.

 

[Kon-Masti]

Have you considered the Yotank? I believe the front is secured to the back by being screwed or Allen-keyed so technically, the case should allow you with some flexibility in terms of size.