My indie in northern CA quoted about $3000 for a similar job. Parts are roughly $1900. So your quote leaves $1800 for labor. In my neck of the woods that's about 14 hours. I'm told its a 10 hour job or less.
- Clutch kit ~ $500
- Flywheel ~ $750
- LN bearing ~ $620
- RMS ~ $20
PS: you dodged a bullet with that leaking IMSB.