Non-PRO Japanese to English Art/Literary Cinema, Film, TV, Drama

Dear ProZ members,

is there anyone of you who is familiar with D-batteries and such?

In my a cartoon, some people are preparing a puppet who automatically moves his arm to welcome guests at a festival.
The person who created the puppet brings it to the chief to have feedback, and the chief says:

腕以外も動かしたかったところだが、こんなものかな
(I wished to have other parts aside from the arm move, but I suppose it will do.)

後はこのパーツを単一電池の直列繋ぎで取り付けてみようか
(Attempt 1: Now, how about installing this part connecting some D batteries in series?)
(Attempt 2: Now, how about installing it connecting this part with some D batteries in series?

My problem is the second sentence, of course.
What is being installed? The puppet itself or このパーツ? (part? parts?). I'd choose number 1, but I wouldn't want to make a mistake.

Aside from this, do you think that my translation is correct/makes sense?

Thank you very much!