Completed the 42131 alternate Excavator build, very fun, very complex, not as strong as the D11 and app integration not the best, but overall very good - progress pics and end result :
LEGO Technic Figures Racer Overalls Snow Rescue Man Lot Of Two | eBay
LEGO Technic: Mobile Crane Truck Toy (42108) Toys - Zavvi US
LEGO® Technic - LEGO.com for kids
LEGO 42143 Technic Ferrari Daytona SP3 | BrickEconomy
Lego Technic Dump Truck And Excavator Toys 2in1 Set 42147 : Target
LEGO Technic Mobile Crane 42108 Construction Toy Building Kit (1,292 pieces) - Walmart.com
LEGO Technic Jeep Wrangler 4x4 Toy Car Model Building Kit, All Terrain Off Roader SUV , Gift Idea for Kids, Boys and Girls - Walmart.com
LEGO Technic Ferrari Daytona SP3 42143 6379495 - Best Buy