Just be aware: forestry biofuel will soon be nerfed.
Biofuel is not nerfed unless I remember wrong. I saw somewhere else that "saplings with lowest sappiness yields 50% of the biomass now, those with normal sappiness yields 100% and those with highest sappiness yields 150%". This sounds a buff to anyone who use forestry farm.
Unless you are aiming for super tree, cherry tree which is easily accessed with "highest sappiness" trait. Put the advanced sapling in your farm and you are going to have a lot biomass going. For 1.4.7, the high sappiness also gives a lot of fruit. I am basically sitting at 20k+ apple even my fermenter is running for 100% of time using only apple juice.
It may be a nerf to anyone using SC2 tree farm and MFR tree farm. I believe neither of them able to recognize forestry bred tree. Turtle chopper probably be ok.
On topic: I think peat engine is very good for startup if you come by some copper early game. I used them for my first few machines until I got all my TE machine up. I am also that kind of person avoid anything need manual intervention, hobby steam engine is not my style henceforth.