so I have a 3x8 hybrid, and was realizing this afternoon that my 2001 stumpjumper FSR that I never ride is a 3x9 deore... has much nicer shifters than the cheap tourney stuff on my hybrid....

would I be insane for stripping it of its shifters, derailleur, and swapping them onto my hybrid, along with an appropriate 9 speed cassette? I'd probably end up putting some alivio grade 8 speed stuff on the mountain bike frame then offing it. brakes would be an issue, the mountain bike has hydraulic disks, so I'll need new brake levers for my hybrid as it has all in one shifter+brakelever junk.