I've done similar and it works, but a dedicated TT frame might have better geometry to make position & ride ideal. I've not tried the latter.
You'll need to consider brake levers. I don't think there is enough bend in the ones above to enable them to operate and then you need to consider bar end shifters as well.
I tried a fast forward seat post and it didn't make much difference apart from making me a bit more hunched. I used an in-line seat post instead, which brought me more forward.
Also experimented with an adjustable stem, so you can slam the bars down, but for me, the position was too extreme and I ended up raising the bars to ease the neck pain and allow me to see ahead.
If the Cinelli is a surplus bike and you have donor parts, it may be worth converting, but once a TT bike, then won't be much use for normal road riding.
Good luck