There are a lot of people who would like to see you publish a tutorial on how to do this, and I would encourage you to do so. This question has been around for a long time. Perhaps someday, you will find time. Heck, I would write one myself if I could figure out how to do it.
In the meantime, though, here is what you say:
...edit class/pical.php directly
But, is this the ONLY file that needs to be changed? Are there any html files that must be changed, also?
Your help would be appreciated. Right now, the only way that I can use piCal is to disable the right column and make my theme only 2 columns on piCal pages. I have installed and uninstalled the module I know a dozen times. I would really like to keep and use it.
And, thanks for all of your great modules.