As for my arguement on the jammers, it is very likely they are an ACTIVE system or one which is always running because it is what makes the most sense as to why, if scanners are as powerful as oriel suggests(they arent refer to link i showed you) then its very likely they are always on, even on smaller ships such as shuttles and other craft. After all the empire wasn't able to identify the rebels were on a Lambda class shuttle in the example you gave or their equipment or anything about the interior of the shuttle craft. The only reason it wasn't approved immediately was because Vader himself inquired about it, which he did because of the force telling him luke was onboard.

As for seeing weapons, I assume only large ones could be seen (your heavy twin turbolasers and giant cannons), wheras smaller weapons might be invisible. To take this picture as an example as a highly situational shot of a Venator, the large twin turbolaser turrets are easily seen.

These people have to be able to navigate around space, asteroid belts, etc

Chewbacca is 7'3 (roughly tall) and is portrayed by a guy in a suit.. Humans have been recorded up to 8'11 tall. Thus its fair to assume chewbacca has a similar size to a large human, and a similar mass to an overweight large human. The fact he is covered in hair would have very little impact on his mass (hair isn't heavy, its also dead cells) or his overall energy profile.

But really, this argument doesn't need to go on. We've agreed basic scans would be available, and everyone knows that a vessel sitting in-system wouldn't be able to keep its shape secret. So were set to procede.

Now to my point, on this, your scans aren't going to be clear, because you can not provide a SINGLE case in canon where scans provided any sort of 3d model. Instead 3d models were compiled from detailed PLANS already acquired, see Death Star I and II for this point. The rebels acquired the plans for the death star, which was WHY they were so damned important because normal scans wouldn't provide any USEFUL information except maybe its general size and shape. Which is what the 'scans' from the executor provided.

In the CIS War room they appear to have holographic imaging technology gleaned real time from a battlefield, equally in the clone wars series (horrible source but there you go) 3d images seem to be generated, equally in the X-Wing games close range scans of vessels record a 3d image in your ships console.

Even the modern "scanning" devices on space ships can detect small things at close range. And modern cameras can capture a 3d image with little technology...

The idea that star wars would be behind the real world in this respect is risible.

Equally poggle recieves real-time 3-d scans of the area around his new foundry. Although I think you make the assumption that a visual scan is not a "scan", which would appear to be incorrect, no detection suite would be complete without visual sensors.

As for the actual scanners, I have said you can have a general size and shape but beyond that your SOL, because as you have agreed the scanner would not be able to penetrate the hull, and as such you WOULDNT BE ABLE TO TELL JACK ABOUT IT. There is no detail scan, because scanners on any of those spectrums listed wouldn't provide you with a detailed scan of a metal hull.

As for chewie, the sheer mass would be much more than a human, because while he was played by an actor in a suit he would STILL have far more mass than a human because of the fact of his general size(ie bulk) and as much as you may deny it, hair may not weigh much individually but neither does a piece of paper by itself. The weight adds up, especially when your body is COVERED in it, especially to the level which Chewie's is.