Space Marines (and Chaos SMs) should always have a few Rhino APCs in my opinion. Regardless of whatever is in vogue in terms of army selection for games, a mechanised column of Marines is just a cool image I think.
My Sin Eaters ended up with three Rhinos, the first of which is here. This Rhino was usually used to transport a Squad of Plague Marines. This was the second Rhino that I assembled and subsequently become known as the “jacuzzi rhino”.
While I still like the first Rhino that I put together (photos to follow eventually) it was pretty austere by the standards of most Chaos vehicles. Although I deliberately played down much of the more baroque aesthetic that tends to be ladled all over most Chaos armies that I have ever seen, I did get a little carried away with this vehicle in particular.
In fact as the army went on everything got more baroque really. Still, I dont think that it looks as silly as the myriad of vulgarly overburdened Chaos armies out there. Many are so covered in spikes and skulls and impaled bodies etc that the shapes of the models get so indistinct as to ruin the entire look. IMO, naturally.
The concept for this vehicle is silly but sort of fun: Nurgle is synonymous with corruption, illness, rot and bodily fluids and so I decided to make the tank look like it is filled with snot. A very adult approach I am sure you will agree.
When putting together an army for whatever reason it is important to have a few centrepieces. Personally for armies I think that usually the most important thing is a sense of uniformity in the colour scheme. That can lead potentially too uniform / potentially bland overall look and so it is important to have a few things that draw the eye. While the conversion of this Rhino was not particularly difficult to do it has over the years probably been the one thing that most observers point out in the army.