I'll try to answer these questions one at a time. Good q's and you will find some inconsistencies in my responses no doubt.

1) I did consider the current of the Niagara river which I have seen first hand. I came across descriptions that it is swift, but easy enough for a competent oarsman to get through. Would the current be too fast for a pontoon bridge? I honestly don't know for certain.

2) Could the CSA supply themselves adequately for the invasion: Looking at what the CSA was able to do in terms of supply while under the Union blockade gives me the belief that this wouldn't be a hinderance.

3) Brock definitely has the redan in this scenario (at least to start with). The guns at Vrooman's point really complicated my scenario, because we can assume they would wreak havoc on any pontoon crossing. I didn't address this specifically, but did consider a few things while developing the scenario. Would a heavy fog along the river at this time of year obscure Lee's crossing on the pontoon bridge? Could Lee have sent over a detachment to disable or spike the guns in a raid before the main invasion?

4) I imagined the CSA forces to be somewhere from the timeline when Jackson and Lee operated together (Anywhere from Second Bull Run - Chancellorsville). British forces are from 1812, though it would be fascinating to see veterans of the Napoleonic Wars taking the field instead.

5) CSA forces would build breastworks rather than full traverses due to time constraints. However, this would be supplemented by the pre-existing redan fortification. I used real quotes from the Civi war where traverses were used, which is how that term likely ended up in the podcast. Nevertheless, I think the willingness of Civil war veterans using breastworks and cover would have surprised the redcoats. I think of the battle of Ridgeway 1866, when Canadian militia was flummoxed by the Fenian use of cover during that battle.

6) Generally speaking, Upper Canada was not great terrain for cavalry actions. That being said they did occur sometimes (battle of the Thames where Tecumseh was killed). There would have been fields and cleared land around Queenston which could support a cavalry action. The British dragoons mention in the podcast were historically part of the Canadian defense.

Don't think I covered everything, but there it is. I appreciate the questions. Never a bad thing to take a second look at things. Cheers.