I had one fitted to my 2006 Targa 34 under the aft bunk in the aft cabin, worked well but not sure if T33 is the same. Under the second bunk in that cabin was the CW tank IIRC.
I had two new electric toilets fitted, changed over to fresh water flush and a SS 200lt waste tank, pump to empty overboard + all new hoses etc circa £5K, 38' MOBO.