Yeah,the orchids are fantastic.That nano kit will probably take your capacity down though,the orchid has the buldged out tank that goes to 23mm in the center,and i believe the kayfun tank is straight 22mm.I know they arent exactly the same,but i tried the quartz nano kit from fasttech on my orchid,and took it back off after 1 fill,the capacity with it was horrible,i got less than 1.5ml in it and that was with filling from the bottom.Now on the other hand,i am working with another member here to get a solution to this.I bought the full size quartz kit,and am sending it to the other member who has the tools needed to cut glass,the full size kit is about 1/4" too tall so the chimney doesn't reach the top cap,so he is going to cut this glass to make it work with the orchid,and if successful,we will have what i consider the perfect rba,as the plastic tank is the 1 and only complaint i have on the orchid.
Also,the fill screw is definitely a plus on the v2,but if you have the v1 you can still do a bottom fill and get a good capacity.Another member came up with a good solution,unscrew the bottom base from the tank,and pull apart just a little bit,just make sure not to pull too far so the chimey stays in the top cap,then use either a syringe with blunt needle or a needle tip cap on your bottle,and just stick it between the base and the tank.Leave the juice about 1/4" below the threads on the tank,and it's good to go and no leaks like you can get when top filling.