Finally did some basic maintenance so I can confidently ride my CruzBike Conversion Kit bike.
Thorough cleaning, especially the drivetrain, then lubrication. I guess I'll try wax lube some other time.
Replaced all brake pads; the old pads looked like wedges.
Shortened cabling so much neater, then adjustments.
Oh forgot one thing: I lost the little rubber pad that goes between the frame and the seat pan bracket. I've been on the lookout for something to replace it, ended up cutting a bit off a yoga mat.