That looks great
But dont you need a dampner on the L series engines
With all due respect, yes, you do need a damper, unless you are planning to tear-down the bottom end of the motor after every few runs/outings (depending on how hard you are hitting it - ask Jeff Priddy) and have the budget to replace parts fairly regularly.
Even on normally-aspirated inline four-cylinder engines, we have seen crankshaft journal flexing of two degrees or more with no harmonic damper installed, in our dyno/torsiograph tests. In serious performance applications, you can expect that much flex to shear cranks at the flywheel after a few laps in a road race environment. Inline-six cranks are notoriously worse (ask the BMW racers what they have been going through.)
Anyone who wants to read-up on exactly what harmonic dampers actually do can click the link below for a technical document which our head of damper development wrote:
Click Here (230K PDF)
Chris @ BHJ