I am finally in the second half of the game ( Pocket Clothier ) and only realized there is a better position for different types of shelves and racks
All the Shelves and Racks would be available when the requirements are met. The only one that's a little trickier is Large/Lrg Shelves. You have to actually pick the Star Staff Challenge in Month 12, and be Ranked number 1 as a result in Month 3 next year. If you never pick that challenge, you'll never get Large Shelves.
My biggest enemy is the mobile phone battery. I don't like playing while my phone is charging, but the game drains the battery so fast. The charging speed can't even catch up. Occasionally the game gets forced quit due to low battery and I'd lose some game progress. It's not just this game though. The same situation happened to some other pretty good games on my mobile phone.
I wonder if it is easier to play on a Tablet PC. My fingers feel so sore after holding the little device ( using Samsung Nexus S ) for a long time. It was okay with Cafe Nippon because I can hold it horizontally. Pocket Clothier doesn't have this option however. Hopefully they will make it available later.