Nice setup Hollgi, Maddogmatt is running the Hobie sail on his Adventure and having great results I believe, I think he also uses a dagger-board that makes it more controlable. Hope he spots this thread and can shed some more light.
If you could make a weighted keel for the mirage slot, WooHoo look out Sydney to Hobart
Look forward to seeing how Maddogmatts performs at our up and coming sailing day viewtopic.php?f=44&t=27124
I do not know a lot about sailing but I think having the boom may be an advantage re performance over the Hobie sail, specially when trying to sail close into the wind, as you can control sail tension better via the boom tension and the use of a vang ((soft sail, soft breeze)(tight sail, strong winds)).
Someone with more knowledge, please correct me if I am wrong.
Anyway, look forward to your updates on its performance and hope someone can get some video of you on the water shooting the breeze.