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Solid Wood Yogic Bench

Hi there! I am looking to have a simple park bench made with the following dimensions: 1. Solid wood base seat of 90cm width across, and 45cm depth front to back 2. Height from floor to top of the base of 45cm 3. Height from the top of the base to the top of the back rest of 40cm 4. So, total height is therefore 95cm So total dimensions: 90cm x 45 cm x 95 cm Need this to be durable, made out of from solid wood, engineered so the seat base and back rest never sags even after years of use. I am going to use this my office. I work between 10-12 hours every day at my computer. So, to protect my health, I need to sit cross legged at my desk, in yoga lotus position, while working. Any suggestions regarding cushioning, styling, design are welcome. I also thinking of a removable cushion for the base. But open to suggestions. What would this cost? Thanks, Samar