The DP503 checks off all the usual boxes for a modern chassis with it's material mix, aside from the one notable difference of a 4 mm thick glass panel, whereas 3 mm has become the de-facto standard these days. The front of the case is pretty deep as well, with a very noticeable metal mesh structure. This is clearly the area where the DP503 sports a design element, as the rest of the body doesn't stick out from the crowd.
Antec framed the mesh panel, which does look pretty nice with the deep recesses, inside a solid plastic shell. The mesh is fine enough to act as a dust filter and you may also remove the cover to reveal three ARGB equipped fans installed on the exterior of the front of the chassis, thanks to the beefiness of the front cover itself, meaning you will have ample space in the interior to work with. Alternatively to the existing fans, you may install three 140 or even two 185 mm intake fans here. Looking at the rear of the DP503, it sports a classic interior layout, with the PSU on the bottom of the chassis.
The main side is covered by a nicely framed, clean glass panel, held in place by two thumb screws. On the opposite side, you will find a metal panel, also secured in the same manner as the glass window.
Taking a closer look at the rear, the PSU bay on the bottom comes with a mounting frame, as you are meant to slide the unit in from the rear of the chassis. Above that are the seven expansion slots, with each being protected by reusable, vented covers. In the very top, there is a mounting position for a 120 mm exhaust fan. Interestingly enough, Antec does not include a unit here, while many brands opt to at least provide a non-ARGB variant.
In the top, the DP503 comes with a magnetic, metal mesh cover, under which you will find mounting positions for three 120 or two 140 mm fans. Alternatively, this part of the chassis may also hold a radiator of up to 360 mm in size. We've seen this IO layout on several case bodies that may have the same factory source. The labeling may be odd to some, as it is sideways from a typical glance. However, Antec provides a modern set of IO ports, including a USB-C plug - albeit being a bit roughly implemented. On top of that, the blue USB 3.0 ports are a bit of an eye sore, black would have been the right choice here instead. As the DP503 ships with an ARGB controller, you also have an LED toggle button instead of a reset button.
On the underside, there is the usual PSU dust filter, which you may pull out of the back of the case for easy cleaning. If you look closely, you can also see the two possible mounting positions for the floor mounted HDD cage. It is held in place by two screws, so you will have to tip over your system to get to these unfortunately.