EDIT: I have redesigned after getting some excellent feedback.

V5 Part A and Part B are below.

I have designed a build platform holder for the SL1 because I am lazy.

It works with low to mid sized models - taller models will still need the caveman approach of holding it in place order the vat or wasting a lot of resin.

The original model was a single object but supports killed the look of the model. I divided it into 2 models and have placed a notch on one point of the platform holder that needs to the facing the closed back of the machine fitting.

Recommend a good strong glue and allow plenty of time to set/cure

Design in Tinkercad as my license for Fusion 360 had lapsed.

Print instructions

PLA
0.15 Speed profile
20% in fill
12.79 meters of filament
Just over 3 hours to print.

RESIN
0.05
1119 layers
55ml resin used
PRUSA GREY TOUGH
4 hours 36 minutes