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(for those not familiar with Snowdon - its a mountain in North Wales, UK)
It would be useful if scmael posted the schematic as an image for those of us with normal eyesight. Posting in a proprietary format limits the audience.
It look OK although I can't see a use for D4 and R6, I think the output of the 555 can go straight to the counter.
Your display will be very dim, the 4026 is only rated to supply 0.5mA and you should use current limiting resistors in each line feeding the LEDs.
You also leave two pins of the 4026 chips floating, this is bad practice and can result in unreliable operation or damage from static causing latch-up.
There are far better and much simpler ways of making a counter like this but maybe you are tasked to used these components.
You will need decoupling capacitors across the supply lines too.
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