The MVVS .15 is a huge engine. I doubt they would make a .11 or .12 out of it. It mnight be interesting though. But making a 11 or 12 out of that big MVVS .15 would put you at a weight disadvantage over the smaller other brand engines in that size range. Now MVVS used to make 2cc and some smaller engines but they quit doing that quite a while ago. I took a look at the Pe Reiver's MVVS site and I didn't see anything smaller than the .15 engines depicted there for sale.
I have the MVVS 1.5cc diesel engine and it has a one piece crankcase and cylinder so you cannot rotate the cylinder around.


Here is a pic comparing the MVVS .15 to the FOX .15 engine.