T2-21 Builders Alert!
You can download the correct bulkhead #4 illustration HERE as a PDF (A4 sized).
The freebie article and files are updated.
In the original pdf the cooling tube hole & the 10 mm hole for the push-rod where set too high. The cooling tube hole can be used at the higher location but the push-rod hole would mean you need to bend the push-rod downwards and also you might have some clearance issues with one of the rudder base mounting bolts... Sorry. :(
I'm sorry about these issues and I'll try and do better in the future...