Pretty cool stuff. This can be modelled with f3d. I also understand as a beginner, you won;t be there in an hour. Here is what I'll say about why I switched to f3d. It is 3 things:
1) modelling parameteric surfaces. This allows me to make some organic shapes, and because they are parameteric, I can tweak profiles to dial in fit. With 3d printing, this helps me to easily take into account shrinking. This is likely applicable to you, as I can see you using extruded spline sketches, and then applying your textures on those surfaces.
2) T-spline modelling; which you can pick up quickly [click the purple cube button], allows an organic freeflowing push/pull interface that is a more like modeling clay; you grab edges and surfaces and just pull them where you want them.
3) most importantly, this forum. The people here are excpetionally helpful! To the point where they will often take your model, fix/change/update it with somethign you didn't understand, and then give it back to you. What I do is, shearh here [or sometimes I use a search engine [I use bing], and type "Fusion 360 modelling a box" Or "Fusion 360 modelling an egg shape." You are bound to find somthing that will help you make progress. If/When that doesnt work out, ask here. For example, to make that heart shaped box, you could sketch the heart, use an offset of that sketch to set the wall thickness, then extrude it. I also find that watching NYCCNC tutorials can give you plenty of good ideas on how to best model things.
Anyway, hope we can help.
