It's a nice idea, but I think that a lack of memory will let you down eventually. (when you've added a few more test things, got some clones of your servers running for when you test updates, have a machine running for some project etc)
You're running a file-server (and multiple VMs) on a single hard drive. - that's not only a good way to loose everything at once (if your drive fails you lose all data and all machines. - but it's also going to be the big bottle neck for your system. 8 systems using 1 disk, in a hyper visor that'll be ham strung for RAM, and so probably will use memory caching to disk in swap space- and your VMs will be trying to use their own swap/page space on the disk also... - try getting more disks and setting up a RAID array for faster access/data security.
you have listed
SUPERMICRO SYS-5018D-MTF 1U Rackmount Server Barebone LGA 1150 Intel C224 Express PCH DDR3 1600
(tech specs say 4 x ddr3 memory slots)
then you have
Crucial 16GB (2 x 8GB) 240-Pin DDR3 SDRAM ECC Unbuffered DDR3 1600 (PC3 12800) Server Memory Model CT2KIT102472BD160B
Kingston 8GB 240-Pin DDR3 SDRAM ECC Unbuffered DDR3 1600 (PC3 12800) Server Memory w/TS Hynix B Model KVR16LE11/8HB
so you'll find that you have two stick or memory without a home!
the processor is good.
overall the mainboard lets you down, (for the sake of a rack mount chassis).
you don't say what your budget is...
but for roughly the same money.
I'd drop the $492 case board combo
and get a better server board:
ASRock EP2C602-4L/D16 SSI EEB Server Motherboard Dual LGA 2011 Intel C602 DDR3 1600/1333/1066 - Newegg.com
you can keep the same processor, even get a second one in the future when finances allow, and your 32GB memory limitation is gone, (upped to a 512GB RAM limit for the board).
you could choose to deck out a quarter of the board with 32GB of RAM (same as you were planning to buy), but personally I'd spend some of the money that you saved earlier getting a larger capacity stick rather than 4 smaller ones.
Kingston 32GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model KTH-PL316LLQ/32G - Newegg.com
the reason is again the ability to upgrade.
then I'd get a cheap and cheerful server case (no hot swap drives etc - which you can't use with a single HDD anyway!)
Logisys CS4801BK Black Server Case - Newegg.com
essentially the budget was $1452
Taking off $319 (4x8GB RAM) taking off $492 (server case + small motherboard) (-$811)
and replacing it with
1 x 32GB stick + $472
Larger motherboard with more future capabilities + $309
Large 4u server case (allows future expansion more drives better cooling etc + $52
that's 22 bucks more...
(and 3 units more)
but allows you plenty of opportunity for future expansion.
(more RAM, more CPU, more HDD etc)
and will probably be quieter, (small 40mm fans do generate a lot of noise)
(if you stayed with 4x8GB sticks instead of a single 32 GB one then you actually save money ($130) getting a more capable board and a larger case. - perhaps use that to get a nicer case? -or a second hard drive)
Even if you're not planning on running anything too heavy right now, don't expect that won't change.
Essentially, I'd start with the same as you have now. but a case that is not a 1u rack mount.
I'd get a cheaper case and a more capable motherboard for less money.
I've use the saving to get a second hard drive and setup a RAID 1 array at the start of the build.
(or possibly two smaller hard drives and setup of a RAD array for storing OS system disks, then have that large drive for Data drives) (and with all my data on one drive, I'd want a pretty slick and regular backup strategy too!
In future I'd expand as necessary. - though it seems likely that with 32 GB of RAM at the start this will be the first thing to show signs of lagging.
then if you need a machine that big (by the time your board is "full" that could be 16 HT cores (32 threads) at 3.4Ghz with half a terrabyte of RAM. you're probably going be looking at getting a "real" data storeage solution, (SAN/NAS, Iscsi, real SCSI or Fibre etc (in a seperate box))