Humm...well if you would like to take the lower part,i'm quit sure that you have to take the the key bed,usually all German players have the lower parts attached to the key bed,and yours would not be an exception.I's hard to gess what kind of mechanism you have because the tracker bar it's a regular 88 note one,used in regular 'pumping' players.The Recordo system it's just that bar,but usually the first and last 4 holes are greater,but no problem if they are regular like yours,and Standard actions had this systems in there piano.The reproduction players have divided stack actions for simulating the right and left hand independently,this way you can have different levels of sound at the same time( Duo-Art,Welt-Mignon,Triphonola,DEA,etc).In expression pianos you have also different levels of sound but for all the entire 88 piano notes at the same time (Phonolizst,Recordo,Melodica,Aria-Divina etc).In my opinion there is no better or worst players pianos,or systems...well,just well made and not very well made machines.I (and this is just my opinion)prefer German players (specially made by Ludwig Hupefeld,special the early models) every little thing was very well done,the woods were dry and very well chosen before construction,the skins were first quality,in many players they used zephir leather for me the most of the sensitive of the skins,pillow pouches,good chromium bath in the metal parts and so on.They worth the price of a car,don't forget that...This made them very exact and responsive machines.You can see my 1913 Phonola vorzetser restore in this site at http://pianola.21.forumer.com/viewtopic.php?t=462 (thanks to Niels help)
and see what i'm talking about.For me the Rolls Royce of the palyers.
But don't forget that there are also Bentleys,Aston Mirtins and Ferraris.
When you have a vorzetser (push-up piano player) you don't have to mind about the piano,because it's your choice,
When you have a player piano you have to look at this both parts,have a good player machine in a good and responsive piano.Usually,German player machines were fit on very good pianos like,Steinway,Grotian-Steinweg,Berdux,Carl Ronish, and many very fine others that ended with the 1st or 2nd world war and we never had heard about them.In same cases after the 1st world war lot of them had fake French names to get the UK,French and many other EU market.And so on,and so on...all of this to tell you that i'm sure that you have a fantastic player piano.Get all the notes you need to dismantling the player,do it smoothly with no hurries,try to understand where each valves goes and what for,step by step you'll understand it,i'm sure.