Great job. Very efficiently done. It looks very nice.
Two comments:
1) Safety: You may consider installing an acrylic or transparent plastic strip (2 to 4 in wide) longitudinally on top of both fences, just over the blade's line. Also adding a block to the back of the rear fence, just where the blade cuts in, to prevent putting your hands accidentally on the line of the blade.
2) Accuracy,--i.e. setting the rear fence at 90 degrees to the blade: As error is proportional to distance, the larger the test piece, the better. The 'flip-over' technique you used would be even better with a flat MDF or plywood rectangle or square, as large as your sled permits. Also you may try the '5 cuts' method to test accuracy, as done and lengthily explained by master craftsman William Ng in a Youtube video. All the best.

Table Saw Miter Slot

BEST ANSWER: It fits my DeWalt table saw with a 3/4 slot in the table. The bar is mounted to a home made cross cut sled. One thing that I have to be careful of is when the sled extends too far beyond the table, the miter bar has decreased contact with the slot and allows the sled to wiggle side to side.

Table Saw Miter Slot Bars

• To add these expandable miter runners to one of your sleds, begin by cutting runners that are 1 ⁄ 16 ' shallower and narrower than your miter slots. Next, attach some cloth-backed double-faced tape to the top of the runners and center them in the miter slots.
• Amazon.com: miter slot runners. Skip to main content. Miter Bar Slider Table Saw Gauge Rod Woodworking Tool Aluminium Alloy Saw Blades Parts Accessories(300mm) $12.99 $ 12. 5% coupon applied. Save 5% with coupon. Get it as soon as Wed, Dec.