Thinking about trench composting

Hi! I have been thinking about trench composting this year. Thing is, I don’t know anyone who has done this.. and conversations with those who have done it really make a big difference in the learning curve  I have the basic concept down.. dig a trench 12-18” deep and as wide as i want. Fill it alternating with food scraps, soil backfill... I am planing on using a little bit of fall leaves as well.
Here are my questions:
1.  i do have chickens however and they use pine shavings.. can i use these as well in the trench?
2. Can I use these trenches to plant my vegetable garden in the spring?
3. If so,  What month do i need to stop using my trenches completely so I can plant in the in the spring?
4.can i use seaweed in this style of composting?
Thank you so much for reading. I love composting, bunt just don’w Have the time to properly care for a pile compost.. really looking for a lower time commitment compost style.. that doesn’t cost me money!

I've been trench (or pit) composting for years with fine results.

1. Yes
2. Yes
3. I plant mine as soon as they are filled; I just cover with a few inches of good soil.
4. Yes

I do it too. Sometimes I throw a bit of lime on top of the waste if I have a lot of citrus (I only bury what the rabbits won't eat- it's mostly citrus rinds and onion peels....), and plant right on top. Mulch it good and you have a nice soft garden row there.