We had a lowish budget wedding; registry office then victorian community centre.
I made all the decorations; bunting from old clothes/left over material from projects. Signage from really old book pages (each page was 1 letter of a word). Flowers, 2 friends bought them all as a present and we arranged them in jam jars of all sizes I had been collecting for months. Some LED fairy lights, I bought some festoon lights (bit expensive but I will defo use again and I couldn't find anywhere that hired them). Chequred paper tablecloths. It looked amazing when it all came together, very low key, vintage and romantic.
We provided most alcohol but asked on the invite for people to bring a bottle (we didn't ask for gifts), if anyone offered we asked for desserts to be made.
I organised everything seperatly, fridges, drinks, canapés, main food, desserts, corckery, glasses, etc. In retrospect it would have cost a similar amount to have got 1 company to do it all and less stress! We mainly used Costco and a guy to do hog roast and all the trimmings. I paid 2 people to tidy/clean and lay things out throughout the day (they werenter great at this...).
We did away with anything WE deemed unnecessary and 'wedding industry' (chair ties, wedding cake, fancy cars, rings (!), first dances etc.) This saved loads!
I think with low numbers it would be fine and easy, however we had over 100 and it took a crazy amount of planning and organising, but maybe that added towards the spirit of the event as literally all our guests played some role!