Can the camera have a 90¡ angle on the vertical axis both up and down on Proaim Astra 12ft Camera Jib Crane ?

The camera plate on the Proaim Astra 12ft Camera Jib Crane is capable of upward and downward movement of up to 45 degrees.

How can we attached DJI RS2 gimbal with Proaim Astra jib (SKU: JB-AS04-00) ?

To attach the DJI RS2 gimbal with the Proaim Astra jib, you will need the following adapters.
Here are the links to both products for your reference:
DJI-QR: https://www.proaimusa.com/products/flycam-quick-release-mount-for-ronin-m-mx?_pos=6&_sid=5c2244d54&_ss=r

P-QRG: https://www.proaimusa.com/products/proaim-quick-release-plate-for-hand-held-gimbals

ASTRA 8FT - I need more precise data regarding the dimensions. Not only the total length of the arm, but the length of the arm from the axis of the stand is important (we work in the operating room).

The length of the Astra 8ft is as below.
https://prnt.sc/1126qh6

\" I was wondering if it is at all possible to get just the 4ft extension piece to expand the 8 foot to a 12 foot in the future? \"

we do not recommend extending the length of the Proaim Astra 8ft Camera Jib Crane (JB-AS08-00) using additional extension pieces so as to avoid any compatibility issues.