Print-Ready 4x6 Postcard Redesign

I have two flat PNG mock-ups of a 4" × 6" postcard that already show the exact look I want. I now need them rebuilt as press-ready files for GotPrint. Please keep every design element exactly where it is on the mock-ups—this is strictly a production job, not a creative overhaul.

GotPrint’s specs call for:
• 0.125" bleed on all sides
• 300 dpi, CMYK color profile
• Safe zone observed so no text is trimmed

Deliverables I’ll need:
1. Print-ready PDF (front and back) that passes GotPrint’s online proofing tool without warnings.
2. Layered source file (AI or PSD) so I can tweak text later if needed.
3. A quick JPG preview of each side for on-screen approval.

I’ll supply the original PNGs as soon as we start; you return the final package ready to upload. If everything aligns perfectly with the mock-ups and the printer accepts the file, the job is done.