Naw, no need to part the old machine out. The needle plate is rounded thing at the bottom of the picture. If the slide plate is missing Sew-Classic has those. I've seen tensioner assemblies too but can't remember where. My local guy has them as bits and pieces for reasonable prices, so I'd start there for everything.
I've rescued machines (Singer 66s to be exact) from the inglorious death of being parted out only to find they sew like champs.
Joe