It's just the car model doesn't have any 'material' where the suspension arms attach to the car. I hope Eric improves that with the updated cars (just make it twin keel or something). I also hope a solution to the MRT's naff looking roll bars are found - gaps just look wrong. I fixed then in 3DS in about 2 minutes, although that might not be something the LFS render engine can cope with.
Well, the suspension has to hang on the car. That can be a single keel (?) or a twin keel. I think Tristan uses twin keel because otherwise the whole suspension of the FOX should be editted.
Well it's much more common, more standard and afaik twin keel only exists in F1, and not all teams use it for that matter. There is also the V keel that exists, which provides the rigidity benefits of the single keel and the aero benefits (a hole in the middle under the nose) of the twin keel.
Also last year McLaren started using a no keel suspension. I believe what they do is attaching the lower arms to aero flaps under the nose, which are attached to the car. Since those flaps would be there anyways to improve airflow, using them to attach the arms means that there is a bigger hole under the nose, providing better airflow. Other F1 teams use it this season and that suspension design seems to force the teams to have the upper arms leaning upwards for some reason.
Now that said, the FO8 and FOX are pretty close to a F3000 and a F Renault I believe, and those cars use a single keel suspension (As said previously I believe other designs only exist in F1). So that can mean 2 things: either the visual suspension does not reflect the physical suspension, or if it does, the cars do not behave like they should/would with a single keel, because the lower arms would be longer.