The attached video is of the London Symphony Orchestra, hardly a radical group, playing Sibelius. The answer to many of your questions can be found at 6:15. The celli are in the center right of the orchestra, the bass viols on risers behind them dead center The 1st violin are on the left, the 2nds on the right, violas to the right of the 1st violins. This is just one of the many layouts commonly employed outside the US.
In fairness, LSO does use the basses on the right configuration, but in the next clip, they are again with the 2nd violins on the right layout playing Prokofiev. Guess where the bull fiddles are perched.
As for my comments, I believe they've been accurate for the most part and I have tried to be polite.