Ebay and Tamiyaclub are your two main sources of vintage parts, one of the Tamiyaclub members makes alloy replacement parts for the Astute, and another is currently developing a
range of reinforced replacements. A few of the parts are compatible with Tamiyas TR-15T nitro truck which uses reinforced versions of the parts and are still readily available from Tamiya.
As for a body Kamtec make an
Astute replica