Unfortunately I don't have a drawing.
My current idea is simply an old air cleaner assembly look of a flat round piece that is funnel shaped towards the TB.
See the very crude pic below.



Plenum

|------------|
| ------ Intake Pipe
\ ------
\ /
---| |--

TB

Frank McCoy aka Mod-deth aka Mid Life Crisis aka SVT Doood aka mcgainer is a SCAM ARTIST Pre98 Zetec - Some Mods