That sword of ichigo looks great :D. I can give you some tips that might help. First of all here is a carpenter who will appear in stonehearth Qubicle Creations . I didnt make it myself but it really helps to get the feelling for how big your things have to be.
Second try to keep things simple. Stonehearth has a very siplistic visual design so try to keep it simple and only add the most important detail.
I only made replicas till now so i cant give you any advise on how to design a object from your mind.
Last check out things others make. It can help you. Also check this topic: Qubicle: Tips & Tricks for beginners . It got some really helpfull tips.
Hope this helps you! 