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 MOC Tracked Excavator by technicbasics | Rebrickable - Build with LEGO
LEGO Technic 42131 Cat D11 Bulldozer [Review] - The Brothers Brick | The Brothers Brick
Big Crawler Loader (CAT D11 42131 B-Model)
Lego Technic CAT Bulldozer 42131 B-Model MOC - YouTube
42131 LEGO® TECHNIC Buldožer Cat® D11 koji kontrolira aplikacija - AC group - webshop
LEGO MOC 42131 Model B: C-3PO by Plaatart | Rebrickable - Build with LEGO
LEGO® Technic review: 42131 Cat D11T Bulldozer | New Elementary: LEGO® parts, sets and techniques
Big Crawler Loader (CAT D11 42131 B-Model)
LEGO® TECHNIC™ LEGO® TECHNIC™ 42131 Cat D11T Buldožer - Baby Center internet trgovina | Dobrodošli u obitelj.
LEGO Technic 42131 Buldozer Cat® D11 controlled by app
42131 App-Controlled Cat® D11 Bulldozer – Box Of Bricks