You can ditch the sheet metal lower oil pan if you modify the pickup and gain a few inches there. Stock manifolds are notorious for cracking and failing. Timing chain guides are a known weakness if revved very hard for too long in stock form.
My 240z build is currently stalled due to funds and time. Hopefully within the next couple years as kids all get thru high school, work life changes and space increases in the garage, I'll be able to get back on it. There is a fairly active Facebook group dedicated to the vk56 engine, with more than a few swaps and builds active. HPTuners I believe has started to support nissan platforms in the last couple years for tuning. UpRev is the only other supporting tuner software for the engine I am aware of.
JWT has removed some of their VK56 offerings from their web page (valve and spring kits). They are the same as some of the vq35 valve train models though, it just requires 2 more cylinders worth of parts. I also recall reading/being told that a certain model of modern BMW motorcycle shares the same rod bolts, and they are available from ARP of the shelf.
Last couple major tidbits I can think of:
ATI has refused/ignored requests to make a run of balancers for years due to a lack of forecasted sales volume.
AHM Motorsports in Maryland is the shop that built Chris Foresberg's pro drift circuit engine. They are very friendly, knowledgeable, and willing to share their knowledge about the engine.