Thanks again guys,
On studying my Cub kit more closely it does have a very slight thrust angle built into the firewall position so will just mount the motor square with the firewall and all should be ok,
Hopefully the up/down angle is also taken care of,

I guess I was thinking too deep into it instead of just building it but my worry was that maybe the manufacturer of the kit assumed the builder would have more knowledge than me and need to determine an angle but luckily I think it is all done,
I must admit the instructions dont have much detail,

Cheers,Paul