Photoshop Product Image Composite

I have three separate product photos and need a single, catalog-ready image built by extracting only the specific parts and details I indicate from each shot. My rough mock-up will show exactly how those elements should be arranged.

Here’s what I’m after:
• Medium-level texture smoothing so the surfaces look consistent without losing natural definition.
• Backgrounds completely removed for a clean, transparent canvas.
• Colour balanced and brightness adjusted across all components, with every black rendered as a neutral, standard black rather than sampled from the images.
• Precise alignment and blending of the selected parts to match the mock-up layout.

Deliverables:
1. Layered PSD (clearly labelled) for any future tweaks.
2. High-resolution flattened PNG or JPEG ready for print and web.

Quick turnarounds are appreciated; I’ll supply the three source photos plus the mock-up as soon as we start.