Custom Build issue - stderr output

I am trying to download a custom build for Archer C7-V2. All I did was remove PPP and add wake on lan and DDNS packages. I did get an image, but now I am not sure if I should install it.

If I add packages that have dependencies, will the custom build service automatically add those to the build? In general how much storage is saved by creating a custom build vs. downloading generic then adding the same packages?

Updated list of available packages in /home/aparcar/asu/worker1/cache/22.03.3/ath79/generic/build_dir/target-mips_24kc_musl/root-ath79/../../../../../../../../../../../home/aparcar/asu/worker1/cache/22.03.3/ath79/generic/dl/imagebuilder
Downloading file:packages/Packages.sig
Signature check failed.
Remove wrong Signature file.
Pseudo file "/dev" exists in source filesystem "/home/aparcar/asu/worker1/cache/22.03.3/ath79/generic/build_dir/target-mips_24kc_musl/root-ath79/dev".
Ignoring, exclude it (-e/-ef) to override.