So I was procrastinating the other day, looking in the ACL catalogue and came up with this combination:

GA16/E16 crank (88mm stroke)
A14/15 rods
Honda EL (1602cc) pistons (ACL# 4MKRY2772)

The pistons have a 18mm pin so that would have to be replaced with a 19mm pin alternatively bush the rod. They also have a 27.50mm comp height, with the longer stroke they'd come 0.5mm further up the bore which shouldn't be too hard to cope with.

Seems like a strong possibility for an A16 using an A14/15 block and rods. I'll never get around to it but it's a fun thought.