I suggest you to just do a 2D reconstruction of the guy’s legs, it’s a bit easier puppetering it rather than doing a full CG model, although an alternative can be to project the leg texture to the CG model, which can be difficult. Also I suggest to match the speeder shadow to the surrounding elements, and some of them do periodically “light up” which you should match to retain consistency and shot believability.

Also I think you should base the SE shadow as reference, and if you can, also trim down the speeder a bit to make it thinner like it is shown here: