[MT-AU Public] Setting up IPv6

Hello all, I've been scratching my head and banging it against a brick wall for the last month, trying to get this sorted out. In our office, we are announcing a /48 v6 prefix to AAPT from our BGP router. We then have a NAT router for our internal VLANs. We wish to assign addresses to clients within our office. If I set static addresses all works ok so I know it's not a routing issue. We have 4 VLANs within our office to which we wish to allocate a /59 to each. Would anyone have any examples of configs or be able to point me in the right direction, to have our NAT router announce IP addresses to our clients? Thanks, CH.