I don't think this would be a good idea as the Netgate 1100 is not performant enough for such operations, it has just not enough processing power, your services would lag or even crash. Make yourself a favor and buy a Supermicro A2SDI-2C-HLN4F mainboad with an onboard server Atom CPU with ECC/registered-ECC-memory support for round about 250€. Get 8GB RAM and a Western Digital Blue Series SSD (SATA) (WD Blue series have a longer lifetime compared to other equal priced SSD) and a case of your choice. Cost for all round about 400€ with round about 20W power usage. This mainboard is supported by pfsense and you get a real and powerfull hardware firewall for 20% of its original price and you can use all of pfsense modules and features without to worry.