Your Po-2 is really coming along, Csaba (@pikofix). Your musings about the Po-2 are interesting. The actual plane was engineered using very simple technology, so if you are used to dealing with more modern planes you forget that a plane doesn't really need much to fly. Barnstormers used to fly on "a wing and a prayer" and would fix their planes with very simple tools and parts. When I was flying C-141s, I got a chance to fly a Stearman biplane, and was amazed at how different the two planes were.

Looks like a Po-2 can never have too many venturis, my friend @pikofix!
Looking forward to your extra ones!

I tired a few ideas, brass tubes, cable insulation, plastic rods, but so far nothing gave the expected result. I might use the leftover Eduard parts as base, and try to modify those. Let’s see.

Talking about Eduard - they have a special Halloween sale on this weekend, and I could not resist buying their new Zlin Z-226 kit. If the Po-2 was Eastern Block’s Tiger Moth, then the Zlin Trener series was the Chipmunk. Based on the parts, Eduard will release the whole series, from the basic 226 to the last type, the 726, including the 526 AFS, a single seater aerobatics version. A lot of interesting paint schemes are waiting for us! I am really looking forward to seeing the new Eduard kit.

https://www.eduard.com/eduard/trener-dual-combo-1-48.html

In the meanwhile, back to the drawing board, again.

Spiros @fiveten had an excellent idea, why not to stretch a plastic tube over heat, cut it, and build up the Venturi tubes. This might work! I have a few Evergreen tubes in my spares box, and after a half an hour trial, I got a few pieces done. The tricky part is to make them similar to each other - it seems to help when I insert a 0.4 mm brass rod into the Evergreen tube before stretching. I will need one more evening for making more, but that should give me enough (4) large Venturi tubes at the end. The small ones can be a bit more tricky, but I will try to use the same method.

What a great idea provided by Spiros @fiveten and a nice execution of it, Csaba @pikofix
This way you will be getting nice looking tubes.
Maybe heat-shrink tubing could have done the job as well, although I think that is more difficult to control.

I think I managed to make an (almost) exact copy of the small one, and got two acceptable large ones. I need to do the detail work later, but the overall size and shape is close to the original kit parts. I believe if I mount the kit parts on one side, and the handmade ones on the other, then the small difference will be invisible.
John @johnb, heat-shrink was one of the first thing to try (side effect of being an electrical engineer), but I quickly realized that even the smallest one is too big for these tiny parts, and it is very hard to control the process.
George @gblair it is indeed a very good idea from Spiros @fiveten. I think it is the best option, especially if you need a single piece. Making a small batch is a little bit more challenging, but can be done.

The other option would be to buy aftermarket items - yes, a resin Venturi tube set made for ICM Po-2 exists! I would need two sets, and the price including postage would be the same as the entire kit. No way! 🙂

I call these done. Not a perfect match to the kit parts, but I think they will look ok on the model.

1 attached image. Click to enlarge.