Some years ago I have found a good and reliable way for front panel design using multiple adhesive foils. For materials of my choice, see below. It goes like this:

• Use inkscape or similar vector based drawing tool and your measurement tools of choice to design the front panel.
• Print the panel on the plain paper. Cut the frame out. Check the printed outline with the original enclosure. Iterate until satisfied with your results.
• Store the panel's outline into separate layer for later use.
• Print the panel on opaque (non-transparent) adhesive foil of your choice.
• Print the panel's outline onto transparent protective sheet. My preference is slightly structured surface finish, which hides the manufacturing imperfections. Your preference may vary.
• Stick your panel to the surface

My preferred items are Conrad's

• matte sheet #528870,
• textured sheet #529443,
• clear sheet for laser printers #530565,
• clear 160µm sheet for inkjets #529672,
• as well as white sheet for inkjets #529648.

UPDATE: Recently, I have found some alternative and cheaper self adhesive laser printer sheets from Lomond. They are sold by Agem in Slovakia:

• Self-adhesive foil for laser printing, white, A4/25 sheets, 100 µm
• Self-adhesive foil for laptop and phone covers, A4/2 sheets, 148 µm
• Self-adhesive foil laser printing, clear/structured, A4/25 sheets, 100 µm