Dreamcast Arcade Engine Questions About GDROM

[Gforce598]

Hello all, I am about to embark on the adventure of building my own arcade machine with a DC as the core. I have found some info on hacking the controllers to interface with the arcade controls none of them include any info about using the analog stick. I do know that the trigger bottons are hall effect but is the stick? And how can I go about making all three of these work? Also I would like to have a tray for swapping games. I am toying with the idea of useing either a standard CDROM unit either retrofitted with a GD laser assembly (not sure how to do this yet) or maybe a normal CDROM would be able to some how interface with the DC due to fact that I would be running mostly backups on this system. Any info or comments would be greatly appreciated.
Thanks in advance, Gforce598