Geometry Node - align a tunnel parts to join nicely in a circle or any curve?

HI,
Any advise how I can construct tunnels on a curve (in my case a circle or oval curve) … I keep getting so alignment problems. Perhaps the issue is to bend this “tunnel” first on curve before I can use it as an object as in an instance?

image
my geometry node


my layout is to create a circle of tunnel … and at 2 points of it, need to have a junction box. So the 2nd part of it is how to ensure no instance with object appear at that 2 points that intersect with another line?

maybe you wanna try this node setup?

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Thanks it works !!..

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