^ yes. Can't help particularly with the building bit, but upholstery of simple things without pleats is relatively easy. I am a complete novice but have successfully recovered some g plan chairs and a piano bench stool. It is easiest if you do it once in calico, and then cover it with your chosen fabric. you just pull it evenly tight and tack it with nails, and then probably staple gun it (or nail it in properly if you're doing it traditionally). Corners are like neatly wrapping a present. I'd start with something square/rectangular - corners not curves. Measure lots before cutting!
^ yes. Can't help particularly with the building bit, but upholstery of simple things without pleats is relatively easy. I am a complete novice but have successfully recovered some g plan chairs and a piano bench stool. It is easiest if you do it once in calico, and then cover it with your chosen fabric. you just pull it evenly tight and tack it with nails, and then probably staple gun it (or nail it in properly if you're doing it traditionally). Corners are like neatly wrapping a present. I'd start with something square/rectangular - corners not curves. Measure lots before cutting!