Thanks Gerardo,
I finished the front wheel and managed to rake some pictures of the process.
Basically, I built two copies of the tyre. On one copy I marked for the tread. It would look way more cooler if Loudog's tread can be carved out but I didn't have enough in me to go for it so I settled for a simple tread.
Once marked, I cut out the tread and glue it over the other copy of the tyre. Then i apply a layer of wood putty and prick out the filling from the tread before it dries out.
Then I sand down until the desired round shape is reached. Then extra putty can be applied and sanded down further where necessary.
The basic shape of the model is complete and I managed to do some detaining. There are some additions pending around the model. Should be done in a few weeks