The outboard fence he¡¯s talking about (and which Stever Rowe made an alternative out of MDF) is called the ¡°Thickness Stop¡± - it¡¯s still available but no longer has the digital readout.
?Integral fence and the Bowmould are definitely high on the list for must haves. I have and use both but the Centrex while interesting is not on my list but I use a Power feeder a lot. I kick off the Felder version of the Centrex shortly after getting the machine in 2011. But everyone's needs are different. Don't know the back fence you are referring to. Pressure modules are also extremely useful.
I know there has been a lot of interest in Aigner accessories for Felder equipment. I have a CF741 combo machine and am wondering how far I can go with Aigner. It looks like the Integral fence and the Bowmould are home runs. I would be interested in the Centrex as well as a back fence. I don't know if there is a way to use the back fence with the sliding table being at the edge versus the Aigner rails it shows in the catalog it attaches to? Does anyone know what needs ordering on the Centrex to get it to work with the CF741 ie riser blocks, support plates etc?