This is a step in the right direction for sure, and i think much more interface info is present now, thanks very much. The "IF Name" is at least now "ge-0/*" instead of the snmp ifIndex NUMBER. Sadly, still doesn't bring up the port vlan index; they're all still "0" (zero) so i guess 1.3.6.1.4.1.2636.3.40.1.5.1.5.1.5 isn't "it". will dig at that next.
// this looks very much like the port vlan index, seems to match our config
$ snmpwalk -c xxxx -v 2c 10.248.120.105 1.3.6.1.2.1.17.7.1.4.5
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.490 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.491 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.492 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.493 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.494 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.495 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.496 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.497 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.498 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.499 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.500 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.501 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.502 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.503 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.504 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.505 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.506 = Gauge32: 27
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.507 = Gauge32: 252
SNMPv2-SMI::mib-2.17.7.1.4.5.1.1.508 = Gauge32: 27
not getting to far trying to use 1.3.6.1.2.1.17.7.1.4.5.1.1, but i'll keep at it (and accept any help!