BEPUphysics

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            //Load in mesh data and create the collision mesh.
            Vector3[] staticTriangleVertices;
            int[] staticTriangleIndices;

            var playgroundModel = game.Content.Load<Model>("playground");
            //This is a little convenience method used to extract vertices and indices from a model.
            //It doesn't do anything special; any approach that gets valid vertices and indices will work.
            TriangleMesh.GetVerticesAndIndicesFromModel(playgroundModel, out staticTriangleVertices, out staticTriangleIndices);
            var staticMesh = new StaticMesh(staticTriangleVertices, staticTriangleIndices, new AffineTransform(Matrix3X3.CreateFromAxisAngle(Vector3.Up, MathHelper.Pi), new Vector3(0, -10, 0)));
            staticMesh.Sidedness = TriangleSidedness.Counterclockwise;

            Space.Add(staticMesh);

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            var playgroundModel = Content.Load<Model>("TownSquare");
            //This is a little convenience method used to extract vertices and indices from a model.
            //It doesn't do anything special; any approach that gets valid vertices and indices will work.
            TriangleMesh.GetVerticesAndIndicesFromModel(playgroundModel, out staticTriangleVertices, out staticTriangleIndices);
            var staticMesh = new StaticMesh(staticTriangleVertices, staticTriangleIndices, new AffineTransform(Matrix3X3.CreateFromAxisAngle(Vector3.Up, MathHelper.Pi), new Vector3(0, -10, 0)));
            staticMesh.Sidedness = TriangleSidedness.Counterclockwise;

            space.Add(staticMesh);

            space.ForceUpdater.Gravity = new Vector3(0, -9.81f, 0);

            Box GroundBox = space.Entities[0] as Box; // <--- Here its complaining
            Matrix scaling = Matrix.CreateScale(GroundBox.Width, GroundBox.Height, GroundBox.Length);
            Components.Add(new EntityModel(space.Entities[0], playgroundModel, scaling, this, true));

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            Vector3[] staticTriangleVertices;
            int[] staticTriangleIndices;

            playgroundModel = new GameModel(Content);
            playgroundModel.Load("TownSquare");
            TriangleMesh.GetVerticesAndIndicesFromModel(playgroundModel.TestModel, out staticTriangleVertices, out staticTriangleIndices);
            var staticMesh = new StaticMesh(staticTriangleVertices, staticTriangleIndices, new AffineTransform(Matrix3X3.CreateFromAxisAngle(Vector3.Up, MathHelper.Pi), new Vector3(0, -10, 0)));
            staticMesh.Sidedness = TriangleSidedness.Counterclockwise;

            space.Add(staticMesh);

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            playgroundModel.TestModel.CopyAbsoluteBoneTransformsTo(boneTransforms);
            foreach (ModelMesh mesh in playgroundModel.TestModel.Meshes)
            {
                foreach (BasicEffect effect in mesh.Effects)
                {
                    effect.World = boneTransforms[mesh.ParentBone.Index];
                    effect.View = myCamera.View;
                    effect.Projection = myCamera.Projection;
                    effect.EnableDefaultLighting();
                    effect.SpecularColor = new Vector3(0.25f);
                    effect.SpecularPower = 16;
                }
                mesh.Draw();
            }