There are plans for the original basic version#1 of the Eggmotor frame for the 34 inch prop. Go to http://www.eggmotor.8bit.co.uk/chassis.html
There is a downloadable pdf file with dimensions. I’ve only got the ‘prop plate’ and ‘choke hold’ items available on the same web site (shop page). There are sufficient details of parts and pre-tuned engine sources on the pages too.