Dave,
We use a boot mounted bag tank...2 separate pumps
The in tank mod was something we did wen we built grp 'n' cars....that was a long time ago and i cant just recall how we put them together....the method you describe sounds fine though....we tend to silver solder mods to fuel components/rails etc....
The new car was painted last week....and before you start to give me s**t the colour was decided a long time ago.....
Regards
Ian