I have to agree with JAS Grippen , fact is you can't do quality RBII/3D skins without something on the order of PaintShopPro either
I like the RB3D parts system too , alot of files , but many reusable .. in some respects it's more efficient than 1024x1024 ( as example ) for each plane.
I do hope there's a better system for MP paints (I do have some ideas about this), though dynamic download is probably not it.
For those that don't know , I maintain
RB3D\'s Community MMP Paints