Posting an engine is only 1 component of a complete material handling forklift truck especially the larger capacity units Your Lego/Tinker Toy like mobile had more components than just an motive power things like a tranny, steering and driving axles, steering system, mast assembly with carriage and a whole variety of attachment to hand a variety of loads of many sizes and complaint to all the industrial standards from various countries and those every changing emission standards.

FYI the governor of CA has deemed it there will be ZERO engine powered fork lifts solid in the US and highway truck- tailers in Cali - some time in 2030. Sounds like a shrinking market for IC sales of any king hear