K2600S - Screw types on the bottom panel

Hello list,
 

 Looking for a "hard to find" K2600RS and found a K2600S for a good price, thing is, so far seems to be fully functional except for some missed sounds, and that's because the former owner removed the Contemporary board, and probably Orchestral as well.
 

 Fortunately, there are some still available on eBay, so, not a big deal.
 

 The actual issue, is, that some how, I'm seeing that the buttons on top of the sliders are a bit out of place, mostly like not completely out.
 

 When I turned the keyboard over, I found out a cocktail of mixed, unmatched and missed screws, which led me to think that might be the same case for the internals, and somehow the "sliders" board is not properly secured in place.
 

 As a former owner of a K2500X, I can identify some of the screws and where they should be, but the K2600 definitively has some more things there.
 

 I managed to track down all the screw types on the "K2600 Service Manual" but there is no detail, at all, where each type goes, there are some pictures on the internet, but not clear enough to identify what is what, thus, I'm kindly requesting, if there is anyone around willing to share some closer pictures of the bottom (outside) of his/her K2600/K2600S so I can see where should I put what.
 

 Any help will be much appreciated.
 

 Thank you!