Timewhatistime

Parts 15461 comes to my mind... not exactly with the bushing-style end, but should fit though. https://www.bricklink.com/v2/catalog/catalogitem.page?P=15461#T=C

Hm, the axles are quite weird. I don't see any drivetrain for the upper LA, so presumably it is driven via a gear/handle connected directly to the LA. The crane's first stage could use some stabilization/bracing. The colour scheme will remind a lot of people of the 42043.

Maybe the new space could allow for the initial pump (small two cylinders), but driven by a crank, so that no spring is needed for cyclical operation...? Just a thought about your well-designed mini-Volvo...

I don't think it is prohibited, and for now, my intention was just to depict the situation. However, imo we should be careful with parts which don't have a corresponding "original" LEGO part. Otherwise, we would weaken the inherent parts inventory limitation which is crucial for the challenge of building MOCs.

The black 2x5 quarter ellipse looks weird (beneath the slope). Is it real Lego? Edit: No, it surely is not. The axle hole is missing.

Finally, a clever application for the colour vomit pins.

Nice mini-MOC! Is there a spring or any similar mechanism to push out the piston in order to allow pumping function?

Given your even less substantiated inference and the (attempted) offense, I propose to stick to the topic, to argue much more kindly and politely, and to refrain from any fallacious generalizations.

I hope so, too... however, with only 572 pieces in the set, we shouldn't expect too much. 42179 has 525 pieces, so they are about the same size. Admittedly, I cannot imagine how to decrease complexity while each of the eight planets will be included... maybe the outer planets will not. (We cannot rule out anything in TLG's rigorous cost saving programme...)

Moreover, it decreases the slack (which is annoying in case of a worm gear/8t gear combination) and offers a much more pleasant feeling (in my subjective view). On a side note: I remember the gear nomenclature which was published in Technic instructions in the late 1980s. There, the smallest gear was called a "z8", which I read as the German "Zahn" (tooth) oder "Zahnrad" (gear). Today, I once again come across "8z" im your reply. What is your reason for applying this very term, @Ngoc Nguyen?

Oh, there are two recoloured "LA-connectors" in black used for the front axle! Do the new engine discs interconnect with the clutch ends of a (16t) clutch gear? The only purpose in the set seems to save 1L space on the crankshaft.

Yes, please. I really like the colour scheme right from the start.

Have you tried knob wheels for the "switching"? Maybe they forgive the unconventional switching/meshing a little bit more indulgently.

I did a lot of own "research" to solve the crab steering/four wheel steering/locking problem (in another/better way we know from 42054), but I never thought of a setup like yours. I'm very curious if you will stick to this principle and how it will turn out in your final entry.

This plenitude of instructions seems rather confusing to me. Maybe it would be a good idea not to hasten and to publish only fulsome developed MOCs and instructions. High quality solutions need time and dedication... 10 percent inspiration --- 90 percent transpiration.