The RSX engine would require using that platform and IMO that's won't be good for a del sol. It's too high and wedge shaped and I like having double wishbone suspension all around. If I'm not mistaken the Engine and front suspension were designed around eachother, so they go hand in hand. Meaning, I don't think you can use the RSX engine and have a sleek low car like a del sol should be.

A honda branded RSX with a targa would look weird. It would just be an RSX with a targa, not a CRX.