Run the Inkscape.

Preparation the document.

File > Document Properties...

https://s5.postimg.org/98kgicw5z/2018-03-09_14-36-21.mp4_snapshot_00.05_2018.03.09_16.59.01.jpg

Tab the Page > Custom size > Units: px.

https://s5.postimg.org/qluqx7z6v/px_2018-03-09_14-36-21.mp4_snapshot_00.10_2018.03.09_17.56.53.jpg

Tab the Page > Custom size > Tab the Grids > Creation > Axonometric grid > New.

https://s5.postimg.org/gbsby21mf/2018-03-09_14-36-21.mp4_snapshot_00.13_2018.03.09_16.59.44.jpg

I add layers.

https://s5.postimg.org/y33yc7yxz/2018-03-09_14-36-21.mp4_snapshot_00.23_2018.03.09_17.00.07.jpg

I'm sending to a file SVG the finished picture PNG made in the b3d.

File > Import...

https://s5.postimg.org/7i1fgpmav/2018-03-09_14-36-21.mp4_snapshot_00.33_2018.03.09_17.01.08.jpg

In window the 'Select file to import' i'm open the finished picture PNG made in the b3d.

https://s5.postimg.org/ac4ku6bmf/2018-03-09_14-36-21.mp4_snapshot_01.02_2018.03.09_17.02.11.jpg

In window the 'png bitmap image import' i leave the default values.

https://s5.postimg.org/ac4ku6r1z/2018-03-09_14-36-21.mp4_snapshot_01.06_2018.03.09_17.02.22.jpg
https://s5.postimg.org/el9awdp6f/2018-03-09_14-36-21.mp4_snapshot_01.19_2018.03.09_17.02.42.jpg

I paste a copy in the other layer.

https://s5.postimg.org/yfvciirjb/2018-03-09_14-36-21.mp4_snapshot_02.12_2018.03.09_17.04.37.jpg

The size a picture too much. I reduce the size a picture.

https://s5.postimg.org/ysmqos9tz/2018-03-09_14-36-21.mp4_snapshot_02.29_2018.03.09_17.05.11.jpg

Object > Transform... > Scale > Width and Height % 'Scale proportionally' on. Apply transformation to selection once or more.

https://s5.postimg.org/aovz0ru0n/2018-03-09_14-36-21.mp4_snapshot_02.52_2018.03.09_17.06.55.jpg

I delete layer with the original picture. I delete the empty a layer 1 also.

https://s5.postimg.org/ac4kulr6f/2018-03-09_14-36-21.mp4_snapshot_03.34_2018.03.09_17.08.15.jpg

I draw the arbitrary object using "Bezier" tool of.

https://s5.postimg.org/3yfhrd1pz/2018-03-09_14-36-21.mp4_snapshot_04.37_2018.03.09_17.12.48.jpg

I use 'Guideline' for comfort.

https://s5.postimg.org/cgoxvqatj/1_2018-03-09_14-36-21.mp4_snapshot_05.34_2018.03.0.jpg
https://s5.postimg.org/6h16rid07/2_2018-03-09_14-36-21.mp4_snapshot_05.35_2018.03.0.jpg
https://s5.postimg.org/gec7kksbr/3_2018-03-09_14-36-21.mp4_snapshot_11.33_2018.03.0.jpg

Into the same way layer i'm copy and paste.

https://s5.postimg.org/6h16rjnav/2018-03-09_14-36-21.mp4_snapshot_16.12_2018.03.09_17.15.29.jpg

I draw with "Bezier" tool to the acceptable result.

https://s5.postimg.org/mf9whop8n/2018-03-09_14-36-21.mp4_snapshot_25.13_2018.03.09_17.16.09.jpg

I paste a copy in the other layer.

https://s5.postimg.org/5er090jx3/2018-03-09_14-36-21.mp4_snapshot_26.10_2018.03.09_17.16.44.jpg

I delete to Stroke:

Object > Fill and Stroke... > Stroke paint > No paint

I delete to ‘Grids’ 'Guideline' also. For 'Guideline' LKM+Delete:

https://s5.postimg.org/kngxmt0qv/2018-03-09_14-36-21.mp4_snapshot_26.56_2018.03.09_17.17.29.jpg

I select all objects in all layers.

https://s5.postimg.org/y4dw5p5xj/2018-03-09_14-36-21.mp4_snapshot_27.36_2018.03.09_17.18.55.jpg

I export the objects in the PNG file.

https://s5.postimg.org/o72vcnlh3/2018-03-09_14-36-21.mp4_snapshot_27.37_2018.03.09_17.20.08.jpg
https://s5.postimg.org/o72vcogc7/2018-03-09_14-36-21.mp4_snapshot_28.47_2018.03.09_17.20.38.jpg

Result.

https://s5.postimg.org/nubh6jvif/florestino-1-3-1-3-ink-a-1.png

Look on the full version of the video on my youtube channel. 29 minutes 34 seconds.

https://youtu.be/QKHNTo_25lo