I've had it with blueprints. My first one felt very wrong, it was too much of a supercar design, and very 90s. Tried another one but I can't do it on PS. I'll have to draw by hand first. My head hurts. A lot.
It's a SG (smoothing group) issue, google it for more info.
Be careful with your top/roof part, it doesn't match by tessellation....so you probably gonna see thru it...