Girls' Frontline - Procurement Coin

Girls' Frontline is a mobile strategy game which I thought I played for the longest time.
In summary, the player which would be the commander, would command the Tactical Dolls which each of them represents a real-world firearm to defend the human kinds from rebelled automation robots.
I like their clean user interface and also the development of the story.
Yet, I quitted the game as I realized I had spent too much time on it.
Although so, I am still following the game news to continue to follow up with the newly released characters and story.
Those who are interested could have a search on it.


And this time, I was trying to make the 3D model for one of the item in the game, so called procureent coin.
It is valuable and is used to purchase for the character skins and the furniture used for decoration.
I would like to draw for the guns too, but it is way out of my league.
Not to mention if I want to simulate the mechanism inside.
And thus, I changed my target to the coin, which other people had successfully reproduce it.

Procurement Coin Magnet made by others

So the first step was to sketch the shape of the coin.
And it was the most difficult part as I didn't have the exact dimension for the part.
The whole piece of work took me around 2 hours.
And around 1 hour and 40 minutes was used for sketching.

Initially I would like to sketch using rapid sketch feature.
But I gave up the idea as I found in the picture, the coin is placed in slanting way.
That would be difficult for me to draw the coin in symmetry.

Initial approach using Rapid Sketch feature

And I faced quite a lot difficulty in sketching from scratch.
I constrained myself to draw the coin within the dimension 150mm X 150mm X 20mm as it is the standard coin size (from Google).
And there were a lot of constrained used and slight bit of modification will result in big changes.
Below is the final sketch.

Final sketch (which the dimension is not fully defined yet)

And next would be relatively easy.
Just extrude the height required, fillet the edges and apply the material on it.
And voila, the work is done.

Final result

The piece itself is easy from the first glance.

The difficult part is to sketch the part without any dimension given.

And yet, I still used up so much time for it.

Really need to further improve my skill.