Thanks Wojtek, Aaron.
Here is the rest of the sequence, having finished the tank today:
The tank bottom is now on and reinforced with some thickening panels on the inside. A center was marked and the cutout for the carb intake was marked and started. Some filler was needed as the reinforcing that was glued on the inside warped the bottom plate a bit. It's not yet sanded in this pic.
With the cutout completed, a couple of plugs were added from sprue and the blister on the bottom was made using a dab of carpenter's glue. This stuff tends to shrink so a couple of additional dabs were needed to keep it the right shape.
A coat of primer revealed a few areas to fix. The aforementioned dimple on the blister can be seen and the plugs need to be cleaned up. The primer dusted a bit here but no problem.
Next, the cleaned up tank was trial fitted and the location of the two hooks was marked and the attachment points cut from card and CA-glued in place. Thanks to Terry's reference, I got a detail of these hooks from which to work, tiny though as they are. Their purpose was to deflect the tank away from the fuselage when it was jettisoned.
The next pic shows the hooks glued to the attachment points. Pain in the a$$! Why does one's work always stick better to tweezers than to the place that you're trying to attach small pieces? After about a half hour, I got these glued on and dabbed some accelerator on them before they collapsed. As I was doing this, I was building up the light lens with Testors Clear Parts Cement. This requires several dabs before the lens will be flush.
Next, the underside of the model got the oily wash treatment, as did the tank, and the runs were streaked back with my airbrush blowing at full blast. After the stains wre applied to the model underside, I glued the tank on and the next two pics show a front and rear view with the completed hooks.
Thanks for your continued interest and comments. Next comes a flat coat and the fiddley bits and we're done!