This layout combines the Variation 11 and Variation 16 sets to make a double-double track loop. The two sets with no extras are designed to fit together like this. Here is the SCARM file for the combination of the standard kits.
My layout adds some extra straight track to the make the straight sections longer. I have a 4 foot by 10 foot area for this track and it comes close to filling it.
I also wanted a reverse loop.
After this, I used up my remaining turnouts for storage.
The SCARM file can be downloaded here.
Kato Unitrack v11 & v16 with a Reverse Loop