letsbuild54

This looks really good. The pump does look like it might be a pain to get to. I assume it's meant to be accessed from the side since the light bar and crane (when fully raised) are in the way from the top. I don't remember how much force is needed to push it down from 42053. I wonder about a child being able to push it down repeatedly with an extended finger like that.

Orange, white, and blue american style tow truck sounds like the big brother of 60056.

Wow, really cool. Do you have pictures of the train reversers and the place where the train stops to be loaded? What motor is on the trains?

LEGO just tweeted out your Christmas Santa Sleigh. Great work as always. https://mobile.twitter.com/LEGO_Group/status/1208402109634363393

Take a look at 9396. I like it because you can see the driving rings and gears from the top engaging as you select different functions. It's makes seeing and learning what is going on easier than on some of the newer sets. It also shows you how to make a mechicanism that only engages if rotated in one direction but not the other. It was pretty cheap on eBay 6 months ago. I also like 42054, which is also on your list. When deciding between sets, look to see if people have shared C models on here and on rebrickable. Then you will get multiple building experiences from the same pile of bricks. I have purchased several sets off eBay and have never had a problem. Look for sellers with good feedback ratings, read the descriptions carefully, and understand the eBay buyer protection policy and you should be fine.

The old PF train remote allows for proportional speed based on turning the dials. You could turn it into levers using a modification similar to the one someone shared below for better control of 42030. https://www.eurobricks.com/forum/index.php?/forums/topic/91625-42030-volvo-l350f-mods-and-improvements/&do=findComment&comment=2526221 There are some other ideas is this thread.

I started in technic as an adult about 1 year ago after also having very little Lego and no technic as a kid. I started with sets that have 1000 to 2000 pieces, which I thought was a good place to start (42053, 42054, 42030, and 9396). I also built 42079, which I enjoyed as well. I’ll offer you the following additional pieces of advice. 1. If you haven’t already, acquaint yourself with Lego enthusiast websites like this one and Brickset.com. Brickset has all the Lego sets in a database that makes browsing for current and past sets easy with instructions and parts lists. Watch and read the reviews and see which sets people rave about. There’s also a few “favorite set” threads on here that you might want to look at for ideas. 2. Buy used when you’re starting out if there is a good secondary market in Spain. I use eBay in the US. Current used sets will be cheaper and will already have the used price depreciation that comes with breaking the seal and opening the bags. Out of production used sets will be much cheaper as well. This way if you decide to quit Technic and sell, you should be able to sell for what you purchased the sets for and will only be out the seller fees. 3. Look for sets that have C-models that interest you. This will give you more practice and experience with the same pile of pieces. Search this forum’s C-model index and Rebrickable.com. 4. You are paying for the build just as much as (maybe more than) the finished product. Slow down and enjoy it. Try to understand and play with the mechanisms you are building as you are putting them together.

There's an elevator in the mountain cave, 21137, made using the fire pole. Take a look at the instructions to see if it gives you any ideas. I don't have the set, so I don't know how well it works.

Looks good so far. In case your blade solution doesn't end up working out, Artic Helicrane, 60034, is 6 bladed and uses a hexigonal piece for attaching the blades. I haven't looked to see if it will work with those blades though.

This is great! Is there a way to launch the drone into the air using the air pressure, or is it too heavy?

I'm new to Lego and Technic and was wondering if anyone has seen any deformation of suspension components or tires from just bearing the weight of a completed model displayed for a long period of time. If so how long did it take to notice the effect?

This looks fantastic! Thank you for providing instructions. It's incredibly generous of you. I have not assembled my Claas yet, so I might do this model first.

Both Fire Station (60110) and Friends Amusement Park Roller Coaster (41130) have an extra fire pole.