)Hi,
I am a big fan of Model Slipway and have enjoyed building and sailing quite a few of thier models including Tsekoa.Any kit from MS is a joy to build with great hulls,castings and clear instruction manuals.I would install the recommended motors.I have in the past tried to save a few bob installing cheaper motors but it really is false economy.
I personally would'nt bother with a bow thruster unless you are building something really big.The same effect can be achieved using a mixer unit which will give you "tank steering",turn to port and the starboard motor slows or stops and vice versa.It will turn on a tanner.
We may all have differing opinions on the hardware we install.If you are a member of a club or find one close to you you will get lots of tips from members who will be only to glad to help you out.Good luck and whatever you build enjoy,and do it to suit yourself and no-one else and you will be happy.
Regards Andy (Balders)