The photos above show the overall size reference. The pen is a Sailor 1911 Standard (in Fresca Blue in Rhodium Trim) and the phone is an older model 5S (I like the smaller size and have been holding off on getting one of the larger upgrades).
The center metal strips come out and essentially hold the pans in place. You could also get some magnets to glue to the bottom of the pans and leave the metal strips out completely. The full pans fit on the outer tracks, not the middle one, but you can't put the metal runners back in. So magnets are the best option if you want to fill all of the tracks or to add the full pans in on one or both outer tracks.
I will be back to add my review once I get it all inked up, watercolored, and art abused to give my final impressions. So far though, the quality is pretty amazing. I did buy this on Amazon, so I will share that link below. The price seems to fluctuate as I bought it for $49.00, but now I see if for $29.00. The change in price sucks, but the product is worth the $49.00 and it is a steal for $29.00. I currently use a Schmincke Horadam Aquarell Half-Pan Paint Metal Compact Set (12 colors size). I love it and it has my most used/loved watercolors in it. I pretty much us Schmincke Horadam exclusively. The new palette is for my inks and liquid watercolors.
If you have used this palette or have another fav set up, let me know. I would love to hear about the artist tools you use or have created... Altoid tin watercolor palette anyone??
Links to the Products Mentioned Above:
Whiskey Painters Standard Palette (link to Amazon)
Schmincke Horadam Aquarell Half-Pan Paint Metal Compact Set / 12 half pans (link to Amazon)
Sailor 1911 Standard Fountain Pen (in Fresca Blue in Rhodium Trim from Anderson Pens (they are a great company and have awesome customer service)
Also pictured is one of my fav watercolor brushes, Escoda Kolinsky-Tajmyr Kolinsky Sable (links to Dick Blick)