in a nutshell, you need to define this on each site:

Remote:

match address should be defined as pemit ip to any

nonat acl should be same as above.

Central ASA:

Match addres should be the mirror of the remote: permit ip any

nonat acl same as above.

NAT you need to define nat for the remote end leaving through this asa

nat (outside) X

Make sure there is a matching global on the same outside interface.

Routing should be ok as long as your default route for the central points out.

You also need to enable the command "same-security-traffic permit intra-interface"

With this config in place you should be able to accomplish.