Kitchen design apps??

I've tried lots of ways to fit things in - getting a job and a sink in seems to be tricky.
   

I did think perhaps having a gap by the small window would enable me to have floor to ceiling units on that Aga wall.

Anyways here are some answers
Height of room - 7foot 3

Yes. 13foot - should have been 4.2meters....we are adding on a square?

Window height is just an inch off the worktop.

The double doors onto garden - I can't see size specified but I wanted them wide to match the house doors? All doors are very wide. Internal doors are 3ft wide each.
The garden side is very sunny by lunchtime.
Large skylight in new build.
All walls on old build are 1 and a half foot thick - that little nib will be for the steel to sit on.