Chebyshev BPF. PCB design #2.

After some short discussion (or rather asking questions) the design of the PCB has been changed. Now all coils are placed onto the line, capacitors are located symmetrically in respect to coils. The second view of the PCB is following.

The dimensions of the PCB are 63x14 mm (2.4x0.5 in).
There is still space for shields between two consecutive coils, which should allow me to put these coils along the same line.

What is wrong with this design.

1. 1. There are no holes for bolts. It seems that the only possibility to fix the PCB are two nuts you will wind around the SMA connectors.
2. Vias are too far out of the edges of ground polygons. As advised by Michael Krasikov (UA4NE), the vias have to be placed as close as possible to edges to simplify the life of currents.
3. Pads for SMA as well as the central conductor have the rough value and cannot be considered to be 50 Ohms compliant. However, experienced people have recommended ignoring the inner impedance of the BPF, at least because it is almost impossible to calculate it properly, or moreover implement calculations. By the way, whether this is a reason for the insertion loss?