Windows usage

Yes you could. Rather than using something like LogMeIn/TeamViewer, where you'll get some pretty bad lag even with a stable Internet connection, I'd suggest using the Microsoft Remote Desktop Connection application for a much quicker and hassle-free experience (providing you're on the same LAN/WAN network).

 

If you're even remotely serious about CAD, virtualization shouldn't even be crossing your mind. The performance hit is too big.

Remote desktop would be better, yes.

 

What CAD software are you using? The RDP solution works pretty well on a LOCAL network (i.e. not over an internet connection). The one thing about most typical RDP solutions is that GPU acceleration features make not work over an RDP connection.

If the CAD usage is pretty simple and/or limited to mostly 2D, or it's just for occasional usage, a VM might be good enough.