I've bolted the engine plate in and i'm ready to cut out to accept engine and bolt on via engine mounting lugs.
I also lined the whole of the front interior sides with balsa,making the engine bay reassuringly substantial (I was worried the big super tigre 45cc could shake it too bits - but not now).
Having an engine plate, means it's very easy to swap out engines (as long as I have an engine plate template) Unbolt plate for super tigre pop in plate for say NGH 38cc petrol (gas) four stroke. (which I have one)
I'm dabbling with the idea of changing engines i.e not use the super tigre (although it's weight is an advantage)