1. You know whats weird because the font size is the same as the old style you can modify that as you wish under the stylesheet your using.
2. You can add class="tableborders" to the table statement at line 23 of showcat.tmpl to do that
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3. You can do the same as number 2 on the showproduct template around line 578
4,5,6 I can consider those for a future release I do not beleive anyone has ever suggested things like surpressing the display of price etc