Unless they have scaled it up the plan shown is for a tiny (13" - about 1/24) Jetex-powered model. It is of an early version and decidedly semi-scale. The consensus is that a ducted fan will not work at any scale because the air intakes are too small.
There is a Model Maker plan MM1462 for a 34.75" model, possibly available from Sarik, though I have not seen this.
You used to able to buy a disc from Norris, the designer of Bluebird, with plans and other data, again not seen.
Does anyone know about the plans published a year or two ago for a larger model that included decals and a canopy?