Identifying Parts Used For The Escape Hatch of Sariel's Tiger XL Model
First three from what we can see... 




Part: 4735 Bar 1 x 3 with Clip and Stud Receptacle (Robot Arm).





Part 2958 Technic, Disk 3 x 3.





Part: 75c03 Hose, Rigid 3mm D. 3L / 2.4cm.


Last two hidden from view...


4 &amp; 5. Part: 4085d Plate, Modified 1 x 1 with Clip Vertical - Type 4
    (thick open O clip).

I can't see, but I can imagine two crossed vertical 1x1 clip plates, pierced by the flex tubing to hold up the robot arm.  

Sing! Now, build it out.  Now, build it out.  Now, build it out...