The truck is looking great. Keep the pics coming.
For a shorter reservoir, some Astro vans used individual pieces that look considerably shorter.
... and others used a single reservoir similar to like a '96ish K2500 truck.
Those MC's look like an older design. This C5 MC looks similar. You might want to keep an eye on the fluid level... those Dmax trucks have some massive brakes that take a lot more fluid volume than a C5 does.