Need help to determine quality of stereo camera calibration and setting up calibration matrix

I am playing around with two cheap webcams(0.3Mpx), trying to make a stereo camera setup that can measure distances and dimensions of objects. But I am struggling to find out If my stereo camera calibration Is properly done and how to move on to set up the camera calibration matrix?

What I have done so far Is to make a camera rig, where the camera's are set 30 cm apart tilted slightly Inwards so the images more or less overlap each other. I put the calibration checkerboard(A4 size) from Matlab approximately 50 cm away from the cameras. Then i proceeded to take 20 image pairs in different angles and positions via a Matlab script that I made, and feed these to the stereo camera calibration app In Matlab. This is the result i get:

This Is the Image that makes me feel like there Is something wrong with my calibration, as It looks like the cameras are not apart.

Here I have removed some of the Image pairs with higher reprojecion errors

Standard Errors of Estimated Stereo Camera Parameters -----------------------------------------------------

Camera 1 Intrinsics ------------------- Focal length (pixels): [ 829.8567 +/- 4.6262 831.1900 +/- 4.4714 ] Principal point (pixels):[ 437.7113 +/- 1.8180 254.0188 +/- 1.9227 ] Skew: [ 1.7063 +/- 0.3069 ] Radial distortion: [ 0.0024 +/- 0.0067 -0.1042 +/- 0.0281 ] Tangential distortion: [ 0.0036 +/- 0.0006 0.0100 +/- 0.0007 ]

Camera 1 Extrinsics ------------------- Rotation vectors: [ -0.0289 +/- 0.0020 0.1813 +/- 0.0025 -0.0132 +/- 0.0005 ] [ -0.2268 +/- 0.0030 -0.3439 +/- 0.0026 -0.1029 +/- 0.0004 ] [ -0.0209 +/- 0.0024 -0.0018 +/- 0.0024 -0.0438 +/- 0.0003 ] [ 0.0962 +/- 0.0032 -0.2916 +/- 0.0034 -1.8484 +/- 0.0004 ] [ -0.0042 +/- 0.0021 0.1804 +/- 0.0027 -0.0219 +/- 0.0006 ] [ -0.2726 +/- 0.0039 0.1822 +/- 0.0041 2.8569 +/- 0.0007 ] [ 0.0499 +/- 0.0020 0.1646 +/- 0.0024 -0.0207 +/- 0.0004 ] [ -0.2745 +/- 0.0024 0.0080 +/- 0.0022 -1.5557 +/- 0.0004 ] [ -0.2607 +/- 0.0024 0.0325 +/- 0.0022 -1.5807 +/- 0.0004 ] [ -0.2684 +/- 0.0028 0.0384 +/- 0.0025 -1.5800 +/- 0.0006 ]

Translation vectors (mm): [ -150.5696 +/- 1.0617 -46.2962 +/- 1.1548 491.0520 +/- 2.7303 ] [ -214.8622 +/- 1.1726 -40.0423 +/- 1.2625 528.0044 +/- 2.9924 ] [ -164.9147 +/- 1.0168 -69.9880 +/- 1.1023 465.4540 +/- 2.6645 ] [ -37.2595 +/- 1.4144 59.4185 +/- 1.4939 643.6316 +/- 3.5056 ] [ -203.2476 +/- 1.0742 -42.6796 +/- 1.1813 493.9661 +/- 2.7924 ] [ 109.4280 +/- 1.4785 -69.4211 +/- 1.5662 678.8234 +/- 3.6783 ] [ -130.7829 +/- 1.0151 -42.2859 +/- 1.1012 468.7133 +/- 2.6260 ] [ -73.5988 +/- 1.0368 64.6519 +/- 1.1120 473.5281 +/- 2.6423 ] [ -43.1916 +/- 1.0432 73.5025 +/- 1.1112 474.7453 +/- 2.6190 ] [ -204.2203 +/- 1.1513 64.6115 +/- 1.2599 524.6072 +/- 3.0409 ]

Camera 2 Intrinsics ------------------- Focal length (pixels): [ 829.8567 +/- 4.6262 831.1901 +/- 4.4714 ] Principal point (pixels):[ 437.7113 +/- 1.8180 254.0188 +/- 1.9227 ] Skew: [ 1.7063 +/- 0.3069 ] Radial distortion: [ 0.0024 +/- 0.0067 -0.1042 +/- 0.0281 ] Tangential distortion: [ 0.0036 +/- 0.0006 0.0100 +/- 0.0007 ]

Position And Orientation of Camera 2 Relative to Camera 1 --------------------------------------------------------- Rotation of camera 2: [ 0.0000 +/- NaN 0.0000 +/- NaN 0.0000 +/- NaN ] Translation of camera 2 (mm): [ -0.0000 +/- 0.0696 -0.0000 +/- 0.0759 0.0000 +/- 0.4605 ]

If anyone are able to help me get a little bit further with this project, It would be greatly appreciated :-) have butted my head against the wall for a while now