SE/30 card question

Your question is too general for a specific answer. But on some of the PDS Ethernet cards I've seen, you would have to plug in a video card sideways, which would mean you'd have to eliminate your internal hard drive and possibly your floppy drive too to make the video card fit. Some people have created "hack jobs" that use one or more right-angle adapters, but you'd need to source those parts, which isn't always easy.

This thread may provide you with more help.

You are right. just pulled the cover off and looks like the hd is going to be taken out.