you can see my little goat shelter here
http://www.sufficientself.com/forum/viewtopic.php?id=8305&p=215
its literally 6 salvaged pallets, some salvaed RUSTY tin roof, a couple peices of left over OSB board, some left over 1x2's and alot screws and cable ties.
its SUPRISINGLY sturdy.
this one wound up being aprox 8x4, its plenty big enough for 2 full sized dairy does full time assuming there not going to be locked in for prolonged periods...
this one is currenlty housing 2 doelings, but the plan is since i do want more goats, im hoping to have a barn built ASAP, and this will then become the buck house for nigi buck and a wether budy for him.
i dont think it would house more than 2 full sized goats though so if your looking for a larger herd...but it would he easy to expand this by making it longer or deeper or both...size is only mimited to what pallets you have available to you.
though if your going "deeper" then 1 pallets width youll need to go higher, mine is only about 6 ft tall at the front and slopes to 2ft tall at the back, so if it were any deeper than 4 ft it would be a pain in the tuckus to clean out.
i will warn though that young goats can squeeze through small gaps so depending on your pallets you may need to add boards between the gaps. i had to put caps on the end and blcok the gaps in the pallet thats being used as a gate because they could slip through the gaps lol.
goats dont realy need "warm", like chickens they just need draft free and dry. i lined the inside of the pallets by shoving straw into them...works perfectly and a couple coats of "kool coat" on the old tin roof not only makes it not look rusty anymore, but its water tight and keeps the inside quite cool. all in all if does the trick if you just want a couple.