Yamaha CS80

Im interested in buying a kit and can anyone tell me ballpark time an  
experienced tech would take to install a kit
Also how is the midi timing when used with a DAW like Logic

http://www.kentonuk.com/kenton/retrofit_kits/cs80-rk.html

http://www.kentonuk.com/kenton/retrofit_kits/cs60-rk.html

http://www.kentonuk.com/kenton/retrofit_kits/cs50-rk.html


Can anyone tell me if these are the same kit for all three synths

thanks David