German / Italian Topolino

Thinking a light too... and we are talking 1939 model of this restoration vehicle.
I've also seen it on other period Topo dashes, but not all.
I think it takes this style bulb , https://www.fdricambi.com/en/vl1194-light-bulb-fitting-t4w/
Rotates to shine where it's needed .
You can kinda see the bulb glass in there if you zoom in on the dashboard photo .

another style housing ,

1939-fiat-500-a-topolino-trasformabile
 
... for those who've been involved in some sort of creative design process, there is a phase sometimes known as the 'exploration' phase: the first part of which, brainstorming, is where you put ideas, components and approaches on the table without judgement. Don't kill an idea before it is even fully formed!
Some uninhibited freedom at this stage allows for for quantity, not necessarily quality, of ideas, sometimes leading to other directions you might not have initially considered.
Then you make some qualified decisions based on experience, and move into the second part: prototyping.
Unless you're contracted to complete a model by a certain date, the modeler is in the enviable position of determining their own schedule, and take the time required before moving to the next step.
In prototyping, try things out, make your mistakes (not on the model) and let the prototype inform your design, maybe even improve through 'happy' accidents.

So I have three design problems related to my Topolino:
1. Improve the dash
2. Build a reasonable semblance of a roof mechanism
3. Find a suitable material for the retractable roof fabric

(1) Looking at the aftermarket dials and knobs from my stash, I may revert to my original idea of using resin rivets as the rivets better mimic the pull knobs of the Topolino

(2) I think I've got a solution for the mechanism that I prototyped above with brass rods. May need some tweeking, but feeling good about it.

(3) Lastly, the material for the roof.
The three current options are lens cleaning cloth, heavy gauge ziploc bag, and the 'finished' layer of a black leather belt.

Now to test their suitability. (Prototype)

17402767414294354948923960603967.jpg
 
(2) I think I've got a solution for the mechanism that I prototyped above with brass rods.
On the real thing, the mechanism was flat metal strip rather than rod, though. At least on the Simca 5, anyway, so I would guess on the Fiat Topolino as well since the former was a licence-built model of the latter.
 

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