Boy, this is hard. Well my take on this is that if you're planning this to be a temporary thing until she's a little older.....then I say it's a bad idea. And you need to get it over and done with now.
Basically, start establishing a normalcy for your daughter - rather than having her see her daddy everyday for another two years, then suddenly "take her away' from him several days a week.
I think that since she's only 17 months, this will be something she's always known. Otherwise, imagine doing this to her when she's 3 or4? Especially if her dad's been absent most of her life. Would you want her to experience his rejection at that age? Better now when she's young and doesn't see any difference.
Because what if this arrangement doesn't work out? Or what it he decides to be an absentee dad again? It he really wants to be in her life, he'll show it and will make the drive every week. If not, then hey, you spared her the rejection at this tender age of 17 months.
I know you want her to be well cared for when she's in his care but you really can't control every circumstances. Just do your best...like making sure you pack good foods for her or providing a schedule he can follow/use as a guide.
And if he's a good father, he'll do his best. Otherwise, if you don't think he'll give it his best, then your arrangement isn't going to make any difference in the long run.
But make sure that your measurement is based on HIS best....not yours. Sometimes, let dads be dads. Let them do it in their own special way. Even if it's not to your standards. So long as he's not abusive in any way to her. And at least father and daughter are having bonding time. This is more beneficial for her than 3 full meals a day, if you get my point.
And you backing off a little may actually encourage more of his own involvement.....otherwise, you could just drive him away.