Sparkman

Hi there - I've got a 1900's 3\4 czech bass - looks gorgeous but not happy with the volume (always) or tone (often). It's got a carved top and ply back n sides. No idea what the fingerboard is but it's stained black. I paid about 900 euro for it in Prague about 10 years ago. If I replace the sides and back with solid wood and replace the fingerboard is it likely to help the volume, tone? Or is there anything else I can do? Any thoughts\suggestions welcome...tks