Planewave

The parts you mention should work fine to connect the UFC between the diagonal body and the 2" barrel. However, due to the threads, the end position of the UFC cannot be adjusted to your preferation, it might stop at an unfavourable position. We are thinking about developing an Camera-sided UFC adapter with S58 dovetail receptor. This would allow exact positioning to your needs. However it will take months before this product may come to the market.

Its hard to answer this question in general. Yes, the MaxBright II Binoviewer will work with an Celestron 11" EdgeHD. But there are many ways to adapt it. Most (if not all) customers will use a Binoviewer on a SC telescope in combination with a star diagonal. There are many different star diagonals available (or even our Baader FlipMirror II) and many possible ways to adapt it. We recommend that you look at our extensive 24-page manual, which illustrates many possible adaptation options and required adapters: https://www.baader-planetarium.com/en/downloads/dl/file/id/1614/product/4317/manual_baader_maxbrightr_ii_binoviewer.pdf

Furthermore we recommend to take a look at our PDF: Manual and Recommended Use of Baader Star Diagonals (T-2 and 2"):
https://www.baader-planetarium.com/en/downloads/dl/file/id/1617/product/1687/baader_star_diagonals_t_2_and_2.pdf

Unfortunately we don't sell the SolarMax III and don't know its thread sizes and most of all the available backfocus (but we strongly assume that it is very much too small). So we cant comment here on required accessories or functionality.

There will be significantly less signal arriving at the chip area. The exposure times will then be up to 10 times longer - but still so short that it can only be quantified by comparing the signal strength/exposure times with and without filters. A set of real high speed filters will be inevitable. And it is not just a matter of shifting wavelengths. The filter has to be constructed differently from the coating layer arrangement to avoid strong vignetting.

You can find the instruction manual from the website under <downloads> or direct by this link:
https://www.baader-planetarium.com/en/downloads/dl/file/id/157/product/1123/adjustment_collimation_of_newtonian_telescopes_with_the_help_of_the_laser_colli_mark_iii.pdf
On the last page you can see that the Laser Colli needs SR41 batteries, positive side faces out.

The optical lightway can be found under the Tab "Specifications". It is adjustable from 32 - 38 mm.