Fark me, not only do you need a manual, at 195cm you need a sunroof as well
![Gives thy a finger :finga:](./images/smilies/icon_fU.gif)
And at 120kg to go with that vertical advantage let me call you sir your hugeness.
Honestly it isn't hard, easier than any front wheel drive crap. The Piazza was made in the days when all body shells were made the same to suit either non turbo or turbo and auto or manual. The normal approach is to buy a nice auto and a rust bucket manual. Hey presto you have all the bits you need. You might even gat a decent clutch kit out of the donor as well and it will be a cheap conversion.
If you do decide to do do a conversion make a note to talk to me as there is one little sneaky thing you need to know about the pedal box change that I won't go into now.
Good luck with the hunt