Seeing as no-one else wants to help..
Here's the rundown...
Importing the units are fine, as most of the units are in main ra2 --> local.mix file. The problem is, is that they are too small for the game, in a way. The scale for TS, is different to RA2 and you require the voxel section editor, also some units like the Titan and the Wolverine are Shps and therefore you have to manually edit the size frame by frame (Someone correct me if i'm wrong, GFX are NOT my forte)
Ini is a little more difficult...
Depending on the unit, certain things aren't always correct as such. For instance the Amphibious APC logic, of where the vxl changed over water, appears not to be able to function in RA2, and the Disruptor beam isn't the same. Also units like the Juggernaight (Firestorm only) Titan and Wolverine, have different art entries because they are SHPs...
Most of the the logic can be straight copy + pasted from Tiberian Sun into Red Alert 2 and then you modify the code from there...
If you need any help e-mail me on
s_g_1_@hotmail.com 
~Wize