cheap and buildable with early entities, based on ASM-2 (blue assembler). no complex structure or belt waving, minor spaghetti alert. takes input from left and outputs to right. uses chemical plants, asm-2, yellow/red/blue inserter, yellow belts and medium power pole. lamps are optional
requires iron plate, copper plate, stone, brick, green circuit, red circuit, blue circuit, steel, coal and also petroleum, lubricant, water
less than 20mw at peak.

image shows some starving machines but in game everything is good. for purple science to be 45spm, "Inserter capacity bonus 2" tech is required (with red and green science) otherwise it is 40science/min. beyond that is not necessary.
tilable, can fit a bus design easily.
background: I had found another compact design for 0.15->0.16 which was common at that time. I loved that design and also learnt more about game, I was new and noob. I could not find a compact 0.17 design similar to that design. I needed a bootstrapper so I designed this layout.
in case someone needs: https://factorioprints.com/view/-M-PPnKK4nvlpRUTC7sd