I had one Tamron 200mm lens with Minolta mount converted to M42 (and then to EOS), have a look here:
http://www.iceinspace.com.au/forum/s...hlight=minolta
It seems Minolta cameras are quite deep, so at the end, after removing the locking mechanism from the lens and attaching M42 flange (removed from one old and faulty Hanimex M42 lens, and with a little help of my friend in his machine shop) I have another 3.11mm extra focus mechanism movement after reaching focus with 400D (via M42-EOS adapter).
The optical results (when used with external aperture at f4 - f5.6) were quite good, it is actually better than much more expensive Canon 200mm F2.8 (also stopped down with external aperture), and I am going to use it much more often in the future (especially after discovering that I can get rid of mild residual lateral CA in final image with Gimp plugin (freeware, of course)
For manual lenses in general, there are plenty of information available on internet..
One of the web pages I used a lot for initial information is here:
http://photonotes.org/articles/eos-manual-lenses/
There, only non-invasive procedures are discussed, but as I am an "invasive" person, I go for a lot and cut, glue, chip off.. until it fits
I am not sure how QHY8 is mounted, it seems it is M42 or some kind of T-mount?
But what ever it is, I am sure it is quite possible to fit Minolta lens on it.
However, be aware that zoom lenses are not as good as primes in general.