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AFAIK the EVO 1-3 engines are exactly like the 1G DSM motors. Sorry for stating the obvious, but 1G DSM engines will fit a 1.6l CSM. An EVO 7 engine will not fit as it has definately different mounting schemes (seen it).
However, there was some site on the web that described how to bolt a 1G engine in a 2G (vfaq.com?). This might reveal some interesting stuff on the various mounting schemes.
Regarding the 4G15 powered CSM you're right. With some very creative welding, lots of metal work and huge amounts of $$$ to spend you're ready to go for a swap.
I am sorry, but you are incorrect. As a former Mitsu employee, I know more than my fair share. Once again, The Evo 1-3 motor is
Exactly like the
2G DSM!!! Here's proof with a quote from Road Race Engineering.
"EVO Motors: The valve covers of the EVO 1-3 motors will be a kind of titanium color. They are the same as a US 2G motor with nothing fancy. They have the smaller 2G style intake ports, a small runner intake manifold with a larger plenum and a larger throttle body than a 2G motor. Still they are hard to find. Many are from other 4G63 powered cars and can have small 13G sized turbos. They will not bolt into a 1G because there are no provisions for the front roll stopper motor mounts that bolt to the block. Everything in Japan from 94 and up has the front and rear roll stopper motor mounts on the transmission 2G Eclipse style. Many people are running around yapping about how they have an EVO motor in their car. If it bolts into a 1G, it isn't an EVO motor."