I experiment with vsim on vbox from time to time. I wrote a function to convert the VMware version to vbox as part of a larger project, which won't work out of context but here's the gist of it. Check these settings against your config and see what is missing. I can see from your screenshot you have the disks in the right order, but are missing 3 nics. I also don't see the serial ports. Some of the other settings aren't apparent from your screenshot. Check the IDE device type, and the settings at the top of this psuedocode.
#Make it from scratch
vboxmanage createvm --name "$name" --basefolder "$SIMDIR" --ostype "FreeBSD_64" --register
vboxmanage modifyvm "$name" --ioapic on
vboxmanage modifyvm "$name" --vram 16
vboxmanage modifyvm "$name" --cpus 2
vboxmanage modifyvm "$name" --memory 6144
#Make 4 nics on the natnetwork
vboxmanage modifyvm "$name" --nic1 natnetwork --nictype1 82545EM --cableconnected1 on
vboxmanage modifyvm "$name" --nic2 natnetwork --nictype2 82545EM --cableconnected2 on
vboxmanage modifyvm "$name" --nic3 natnetwork --nictype3 82545EM --cableconnected3 on
vboxmanage modifyvm "$name" --nic4 natnetwork --nictype4 82545EM --cableconnected4 on
#If these are missing it can get stuck
vboxmanage modifyvm "$name" --uart1 0x3F8 4
vboxmanage modifyvm "$name" --uart2 0x2F8 3
#A blank floppy image keeps disk enumeration as expected
vboxmanage storagectl "$name" --name floppy --add floppy --controller I82078 --portcount 1
vboxmanage storageattach "$name" --storagectl floppy --device 0 --medium emptydrive
#Connect disks
vboxmanage storagectl "$name" --name IDE --add ide --controller PIIX4 --portcount 2
vboxmanage storageattach "$name" --storagectl IDE --port 0 --device 0 --type hdd --medium "$SIMDIR/$name/$_ide00"
vboxmanage storageattach "$name" --storagectl IDE --port 0 --device 1 --type hdd --medium "$SIMDIR/$name/$_ide01"
vboxmanage storageattach "$name" --storagectl IDE --port 1 --device 0 --type hdd --medium "$SIMDIR/$name/$_ide10"
vboxmanage storageattach "$name" --storagectl IDE --port 1 --device 1 --type hdd --medium "$SIMDIR/$name/$_ide11"
Also, disable VMware tools in the loader. It will fail to start anyway, but no reason to let it try.
setenv bootarg.vm.run_vmtools "false"
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