This might be a question never asked before. I’ve just received a Chinese motherboard, but this dimension size doesn’t match any existing form factor.
COLORFUL H81M-K PLUS V23B = 215 x 170mm motherboard
Such a weird size this PCB . . .
Pretty sure I’ll have to drill and tap new standoff holes!
Existing computer case is sized for Micro-ATX
No wonder I don’t understand Chinese 
Is this a 3rd world problem I’ve incurred
Don’t put the cart before the horse.
Put the motherboard on a piece of cardboard to prevent shorts, then hook up PSU, etc. and do a bench test to see if this monster even works to your satisfaction.
Then attack the case with the power tools and mod to your heart’s content.
Just saying.
Pudge
EDIT:
according to this site.
https://en.colorful.cn/product_show.aspx?mid=84&id=879
it says
Configuration 170*215mm mATX
That would be micro ATX.
Was planning a pure plexiglass case - As this is my wife’s computer and she always wants to see whats going on >> >> LoL
At least this Colorful motherboard has a PDF instruction manual.
I made a mistake buying another generic Chinese motherboard/CPU/RAM combo. As it had no instruction manual and was unbranded.
Finally discovered motherboard was made by Foxconn. Took me forever to figure out the pinout connections – Just discovered by chance a Russian YouTube video of the board
Hello @ricklinux
Well the motherboard is sized smaller than Micro-ATX but larger than Mini-ITX sir.
Well you know what happens when you go outside the standards. 
Zup - There is no standard beer size !! 
Best example I can think of . . .
Cheers @ricklinux
Searching Wikipedia the Colorful [-H81M-K PLUS V23B] dimensions are closest to mini-DTX (form factor)
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