Did you made the schematic?
Because i'm concerned about the small splitter (2in 4out). I don't think such a splitter exist. I did not see this model till now.
To feed multiple antenna to multiple devices a multiswitch is used.
For example the SPAUN model SMK17169F is for 4 antenna in, 16 devices out.
The problem with the multiswitch is that it works only with QUATTRO LNB.
QUATTRO LNB is a LNB with 4 outputs: H-Hi, H-Lo, V-Hi, V-Lo.
If you have 16 antenna inputs then maybe 2x16in switch and TwinLNBs is a simple solution.